[Bug]: LDAP account cannot login

[cbouvier]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Hello,
I cannot login to my instance with LDAP accounts anymore. I get this error message from the logs:

Error   index   Exception: strtolower(): Argument #1 ($string) must be of type string, string             2026-03-25T08:08:11+00:00
                  given in file '/var/www/html/lib/private/Config/UserConfig.php' line 688 at
                  lib/private/AppFramework/Http/Dispatcher.php line 150
...

Looks like some PHP function expects a string as input, but complains because it is given a... string?

Steps to reproduce

I am running Docker image nextcloud:33, with the LDAP plugin, connecting to openldap
I can login as root (local account), but not with LDAP accounts

Expected behavior

I expect to be able to login, just as I did yesterday

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "www.cedric-bouvier.fr",
            "www.veigypirates.rocks",
            "*.localdomain"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "33.0.0.16",
        "overwrite.cli.url": "https:\/\/www.cedric-bouvier.fr\/nextcloud",
        "overwritewebroot": "\/nextcloud",
        "overwriteprotocol": "https",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "dbindex": 0,
            "timeout": 1.5
        },
        "ldapIgnoreNamingRules": false,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "tls",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "defaultapp": "files,dashboard",
        "default_phone_region": "FR",
        "filelocking.enabled": true,
        "loglevel": 2,
        "maintenance": false,
        "app_install_overwrite": [
            "richdocuments"
        ],
        "maintenance_window_start": 3,
        "auth.webauthn.enabled": false,
        "theme": "",
        "trashbin_retention_obligation": "auto, 30"
    },
    "apps": {
        "activity": {
            "enabled": "no",
            "installed_version": "2.15.0",
            "types": "filesystem"
        },
        "announcementcenter": {
            "enabled": "no",
            "installed_version": "6.2.0",
            "types": "logging"
        },
        "app_api": {
            "enabled": "yes",
            "installed_version": "33.0.0",
            "types": ""
        },
        "apporder": {
            "enabled": "no",
            "hidden": "[\"\/nextcloud\/index.php\/apps\/dashboard\/\",\"\/nextcloud\/index.php\/apps\/photos\/\",\"\/nextcloud\/index.php\/apps\/activity\/\",\"\/nextcloud\/index.php\/apps\/contacts\/\",\"\/nextcloud\/index.php\/apps\/music\/\"]",
            "installed_version": "0.15.0",
            "order": "[\"\/nextcloud\/index.php\/apps\/dashboard\/\",\"\/nextcloud\/index.php\/apps\/files\/\",\"\/nextcloud\/index.php\/apps\/photos\/\",\"\/nextcloud\/index.php\/apps\/activity\/\",\"\/nextcloud\/index.php\/apps\/contacts\/\",\"\/nextcloud\/index.php\/apps\/music\/\",\"\/nextcloud\/index.php\/apps\/passwords\/\"]",
            "types": ""
        },
        "audioplayer": {
            "enabled": "no",
            "installed_version": "3.1.0",
            "types": "filesystem"
        },
        "backgroundjob": {
            "lastjob": "3"
        },
        "breezedark": {
            "enabled": "no",
            "installed_version": "20.0.11",
            "types": ""
        },
        "bruteforcesettings": {
            "enabled": "no",
            "installed_version": "2.1.0",
            "types": ""
        },
        "calendar": {
            "enabled": "[\"family\"]",
            "installed_version": "6.2.1",
            "types": ""
        },
        "carnet": {
            "enabled": "no",
            "installed_version": "0.24.6",
            "types": "filesystem"
        },
        "circles": {
            "enabled": "yes",
            "installed_version": "33.0.0",
            "loopback_tmp_path": "\/nextcloud",
            "loopback_tmp_scheme": "https",
            "maintenance_run": "0",
            "maintenance_update": "{\"maximum\":3,\"3\":1774423506,\"2\":1774426201,\"1\":1774426501,\"4\":1653444002,\"5\":1653102002}",
            "migration_22": "1",
            "migration_22_1": "1",
            "migration_run": "0",
            "types": "filesystem,dav"
        },
        "cloud_federation_api": {
            "enabled": "yes",
            "installed_version": "1.17.0",
            "types": "filesystem"
        },
        "cms_pico": {
            "custom_themes": "{\"veigypirates\":{\"name\":\"veigypirates\",\"type\":2,\"compat\":true}}",
            "enabled": "no",
            "installed_version": "1.0.21",
            "limit_groups": "[\"family\"]",
            "link_mode": "1",
            "plugins_etag": "BbGTZCmVAc",
            "system_plugins": "{\"PicoDeprecated\":{\"name\":\"PicoDeprecated\",\"type\":1,\"compat\":true}}",
            "system_templates": "{\"empty\":{\"name\":\"empty\",\"type\":1,\"compat\":true},\"sample_pico\":{\"name\":\"sample_pico\",\"type\":1,\"compat\":true}}",
            "system_themes": "{\"default\":{\"name\":\"default\",\"type\":1,\"compat\":true}}",
            "themes_etag": "pV7ocdXXrR",
            "types": "filesystem"
        },
        "comments": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "logging"
        },
        "contacts": {
            "enabled": "[\"family\",\"cl193\"]",
            "installed_version": "8.4.1",
            "types": "dav"
        },
        "contactsinteraction": {
            "enabled": "no",
            "installed_version": "1.3.0",
            "types": "dav"
        },
        "cookbook": {
            "enabled": "no",
            "installed_version": "0.11.2",
            "types": ""
        },
        "core": {
            "backgroundjobs_mode": "cron",
            "emailTestSuccessful": "1",
            "files_metadata_installed": "1",
            "installed.bundles": "[\"CoreBundle\"]",
            "installedat": "1592718506.4738",
            "lastcron": 1774426501,
            "lastupdateResult": "[]",
            "lastupdatedat": 1774423825,
            "metadataGenerationDone": true,
            "moveavatarsdone": "yes",
            "newUser.sendEmail": "yes",
            "previewsCleanedUp": "1",
            "public_files": "files_sharing\/public.php",
            "public_webdav": "dav\/appinfo\/v1\/publicwebdav.php",
            "shareapi_default_expire_date": true,
            "shareapi_expire_after_n_days": "14",
            "theming.variables": "b522a2cbc575d59d09ddc9122efe2c33",
            "vendor": "nextcloud",
            "files_metadata": {
                "photos-original_date_time": {
                    "value": null,
                    "type": "int",
                    "etag": "",
                    "indexed": true,
                    "editPermission": 0
                },
                "photos-exif": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-ifd0": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-size": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-gps": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-place": {
                    "value": null,
                    "type": "string",
                    "etag": "",
                    "indexed": true,
                    "editPermission": 0
                },
                "blurhash": {
                    "value": null,
                    "type": "string",
                    "etag": "ddc9c4be498c2e56b1ab4854c69d44d5",
                    "indexed": false,
                    "editPermission": 0
                },
                "files-live-photo": {
                    "value": null,
                    "type": "string",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 1
                }
            },
            "oc.integritycheck.checker": []
        },
        "cospend": {
            "enabled": "[\"family\"]",
            "installed_version": "4.0.0",
            "types": ""
        },
        "dashboard": {
            "enabled": "yes",
            "installed_version": "7.13.0",
            "types": ""
        },
        "dav": {
            "buildCalendarReminderIndex": "yes",
            "buildCalendarSearchIndex": "yes",
            "builtSocialSearchIndex": "yes",
            "chunks_migrated": "1",
            "enabled": "yes",
            "installed_version": "1.36.0",
            "needs_system_address_book_sync": "no",
            "regeneratedBirthdayCalendarsForYearFix": "yes",
            "types": "filesystem"
        },
        "deck": {
            "enabled": "no",
            "installed_version": "1.15.1",
            "types": "dav"
        },
        "external": {
            "enabled": "yes",
            "installed_version": "8.0.0",
            "jwt_token_privkey_es256": "***REMOVED SENSITIVE VALUE***",
            "jwt_token_pubkey_es256": "-----BEGIN PUBLIC KEY-----\nMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEDvQ8M\/MGL8oA9yKckqecXwgy0HRq\nB3sMF1HC6bMFGMpE+stn3RvrmBc6u+Xu+CSDBh8hUwDt62X+PEkjutGMbA==\n-----END PUBLIC KEY-----\n",
            "max_site": 4,
            "sites": "***REMOVED SENSITIVE VALUE***",
            "types": "prevent_group_restriction"
        },
        "extract": {
            "enabled": "no",
            "installed_version": "1.3.5",
            "types": ""
        },
        "federatedfilesharing": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": ""
        },
        "federation": {
            "enabled": "no",
            "installed_version": "1.9.0",
            "types": "authentication"
        },
        "files": {
            "cronjob_scan_files": "500",
            "enabled": "yes",
            "installed_version": "2.5.0",
            "mimetype_version": "33.0.0.16",
            "types": "filesystem"
        },
        "files_downloadlimit": {
            "enabled": "yes",
            "installed_version": "5.1.0-dev.0",
            "types": ""
        },
        "files_external": {
            "enabled": "yes",
            "installed_version": "1.25.1",
            "types": "filesystem",
            "allow_user_mounting": false,
            "user_mounting_backends": "ftp,dav,owncloud,sftp,amazons3,swift,\\OC\\Files\\Storage\\SFTP_Key"
        },
        "files_markdown": {
            "enabled": "no",
            "installed_version": "2.3.3",
            "types": ""
        },
        "files_pdfviewer": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "files_readmemd": {
            "auto_refresh": "false",
            "disable_workspace": "true",
            "enabled": "no",
            "fileslist_footer": "[\"README\"]",
            "fileslist_header": "[\"HEADER\"]",
            "installed_version": "3.0.2",
            "show_asciidoc": "false",
            "show_html": "false",
            "show_title": "true",
            "types": "filesystem",
            "yellow_back": "true"
        },
        "files_reminders": {
            "enabled": "yes",
            "installed_version": "1.6.0",
            "types": ""
        },
        "files_rightclick": {
            "enabled": "no",
            "installed_version": "1.6.0",
            "types": ""
        },
        "files_sharing": {
            "enabled": "yes",
            "incoming_server2server_share_enabled": "no",
            "installed_version": "1.25.2",
            "lookupServerEnabled": "no",
            "lookupServerUploadEnabled": "no",
            "outgoing_server2server_share_enabled": "yes",
            "types": "filesystem"
        },
        "files_trashbin": {
            "background_job_expire_trash_offset": 0,
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "filesystem,dav"
        },
        "files_versions": {
            "enabled": "yes",
            "installed_version": "1.26.0",
            "types": "filesystem,dav"
        },
        "files_zip": {
            "enabled": "yes",
            "installed_version": "2.3.0",
            "types": ""
        },
        "firstrunwizard": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "forms": {
            "enabled": "no",
            "installed_version": "3.4.3",
            "types": ""
        },
        "guests": {
            "allow_external_storage": "true",
            "enabled": "yes",
            "hide_users": "true",
            "installed_version": "4.6.0",
            "types": "authentication",
            "usewhitelist": "true",
            "whitelist": "files_trashbin,files_versions,files_sharing,files_texteditor,text,activity,firstrunwizard,photos,notifications,dashboard,user_status,weather_status,calendar,files_pdfviewer,files_external,files_rightclick,files_videoplayer,richdocuments"
        },
        "impersonate": {
            "enabled": "yes",
            "installed_version": "4.0.0",
            "types": "prevent_group_restriction"
        },
        "logreader": {
            "enabled": "yes",
            "installed_version": "6.0.0",
            "levels": "11111",
            "relativedates": "",
            "types": "logging"
        },
        "lookup_server_connector": {
            "enabled": "yes",
            "installed_version": "1.21.0",
            "types": "authentication"
        },
        "mail": {
            "enabled": "no",
            "installed_version": "1.11.7",
            "types": ""
        },
        "maps": {
            "enabled": "no",
            "installed_version": "0.1.8",
            "lastAddressLookup": "1612024351",
            "types": "filesystem"
        },
        "markdownreadme": {
            "enabled": "yes",
            "installed_version": "1.0.1",
            "types": ""
        },
        "music": {
            "enabled": "no",
            "installed_version": "1.11.0",
            "types": "filesystem"
        },
        "nextcloud_announcements": {
            "enabled": "yes",
            "installed_version": "5.0.0",
            "pub_date": "Thu, 24 Oct 2019 00:00:00 +0200",
            "types": "logging"
        },
        "notes": {
            "enabled": "[\"family\"]",
            "installed_version": "4.13.1",
            "types": ""
        },
        "notifications": {
            "enabled": "yes",
            "installed_version": "6.0.0",
            "types": "logging"
        },
        "oauth2": {
            "enabled": "yes",
            "installed_version": "1.21.0",
            "types": "authentication"
        },
        "oidc_login": {
            "enabled": "no",
            "installed_version": "1.6.1",
            "types": ""
        },
        "password_policy": {
            "enabled": "yes",
            "installed_version": "5.0.0-dev.0",
            "types": "authentication"
        },
        "passwords": {
            "SSEv1ServerKey": "***REMOVED SENSITIVE VALUE***",
            "auto-backup\/status": "0",
            "backup\/update\/restored": "0",
            "cron\/php\/version\/id": "80419",
            "cron\/php\/version\/string": "8.4.19",
            "enabled": "[\"family\"]",
            "installed_version": "2026.3.20",
            "legacy_api_checkpoint": "1648033501",
            "legacy_last_used": "1616570397",
            "migration\/customFields": "2020.12.2",
            "passwords\/localdb\/type": "hibp",
            "survey\/server\/mode": "2",
            "survey\/server\/notification": "1592978418",
            "survey\/server\/week": "13",
            "types": "",
            "web\/php\/version\/id": "80419",
            "web\/php\/version\/string": "8.4.19"
        },
        "photos": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "lastPlaceMappedUser": "thierry@veigypirates.rocks",
            "lastPlaceMappingDone": "true",
            "types": "dav,authentication"
        },
        "polls": {
            "enabled": "yes",
            "installed_version": "8.6.3",
            "types": ""
        },
        "privacy": {
            "enabled": "yes",
            "installed_version": "5.0.0-dev.0",
            "readableLocation": "fr",
            "types": ""
        },
        "profile": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "provisioning_api": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "prevent_group_restriction"
        },
        "recommendations": {
            "enabled": "[\"family\"]",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "related_resources": {
            "enabled": "yes",
            "installed_version": "4.0.0-dev.0",
            "types": ""
        },
        "richdocuments": {
            "disable_certificate_verification": "yes",
            "doc_format": "ooxml",
            "enabled": "yes",
            "installed_version": "10.1.2",
            "public_wopi_url": "https:\/\/www.cedric-bouvier.fr",
            "types": "filesystem,prevent_group_restriction",
            "wopi_allowlist": "10.0.0.0\/8,192.168.0.0\/24",
            "wopi_url": "https:\/\/www.cedric-bouvier.fr"
        },
        "serverinfo": {
            "cached_count_appdata_files": 585502,
            "cached_count_filecache": 784247,
            "cached_count_storages": 43,
            "enabled": "yes",
            "installed_version": "5.0.0-dev.0",
            "size_appdata_storage": 824896819,
            "types": ""
        },
        "settings": {
            "enabled": "yes",
            "installed_version": "1.16.0",
            "types": ""
        },
        "sharebymail": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "filesystem"
        },
        "spreed": {
            "enabled": "no",
            "has_reference_id": "yes",
            "installed_version": "21.0.1",
            "project_access_invalidated": "1",
            "signaling_ticket_secret": "***REMOVED SENSITIVE VALUE***",
            "signaling_token_privkey_es256": "***REMOVED SENSITIVE VALUE***",
            "signaling_token_pubkey_es256": "***REMOVED SENSITIVE VALUE***",
            "types": "dav,prevent_group_restriction"
        },
        "support": {
            "SwitchUpdaterServerHasRun": "yes",
            "enabled": "yes",
            "installed_version": "5.0.0",
            "types": "session"
        },
        "survey_client": {
            "enabled": "yes",
            "installed_version": "5.0.0-dev.0",
            "last_sent": 1774051203,
            "types": "",
            "last_report": "{\"id\":\"ocpl93z2hxdr\",\"items\":[[\"server\",\"version\",\"33.0.0.16\"],[\"server\",\"code\",\"other\"],[\"server\",\"enable_avatars\",\"yes\"],[\"server\",\"enable_previews\",\"yes\"],[\"server\",\"memcache.local\",\"\\\\OC\\\\Memcache\\\\Redis\"],[\"server\",\"memcache.distributed\",\"\\\\OC\\\\Memcache\\\\Redis\"],[\"server\",\"asset-pipeline.enabled\",\"no\"],[\"server\",\"filelocking.enabled\",\"yes\"],[\"server\",\"memcache.locking\",\"\\\\OC\\\\Memcache\\\\Redis\"],[\"server\",\"debug\",\"no\"],[\"server\",\"cron\",\"cron\"],[\"php\",\"version\",\"8.4.19\"],[\"php\",\"memory_limit\",536870912],[\"php\",\"max_execution_time\",0],[\"php\",\"upload_max_filesize\",536870912],[\"database\",\"type\",\"mysql\"],[\"database\",\"version\",\"11.8.6\"],[\"database\",\"size\",824508416],[\"apps\",\"activity\",\"disabled\"],[\"apps\",\"announcementcenter\",\"disabled\"],[\"apps\",\"app_api\",\"33.0.0\"],[\"apps\",\"apporder\",\"disabled\"],[\"apps\",\"audioplayer\",\"disabled\"],[\"apps\",\"breezedark\",\"disabled\"],[\"apps\",\"bruteforcesettings\",\"disabled\"],[\"apps\",\"calendar\",\"6.2.1\"],[\"apps\",\"carnet\",\"disabled\"],[\"apps\",\"circles\",\"33.0.0\"],[\"apps\",\"cloud_federation_api\",\"1.17.0\"],[\"apps\",\"cms_pico\",\"disabled\"],[\"apps\",\"comments\",\"1.23.0\"],[\"apps\",\"contacts\",\"8.4.1\"],[\"apps\",\"contactsinteraction\",\"disabled\"],[\"apps\",\"cookbook\",\"disabled\"],[\"apps\",\"cospend\",\"4.0.0\"],[\"apps\",\"dashboard\",\"7.13.0\"],[\"apps\",\"dav\",\"1.36.0\"],[\"apps\",\"deck\",\"disabled\"],[\"apps\",\"external\",\"8.0.0\"],[\"apps\",\"extract\",\"disabled\"],[\"apps\",\"federatedfilesharing\",\"1.23.0\"],[\"apps\",\"federation\",\"disabled\"],[\"apps\",\"files\",\"2.5.0\"],[\"apps\",\"files_downloadlimit\",\"5.1.0-dev.0\"],[\"apps\",\"files_external\",\"1.25.1\"],[\"apps\",\"files_markdown\",\"disabled\"],[\"apps\",\"files_pdfviewer\",\"6.0.0-dev.0\"],[\"apps\",\"files_readmemd\",\"disabled\"],[\"apps\",\"files_reminders\",\"1.6.0\"],[\"apps\",\"files_rightclick\",\"disabled\"],[\"apps\",\"files_sharing\",\"1.25.2\"],[\"apps\",\"files_trashbin\",\"1.23.0\"],[\"apps\",\"files_versions\",\"1.26.0\"],[\"apps\",\"files_zip\",\"2.3.0\"],[\"apps\",\"firstrunwizard\",\"6.0.0-dev.0\"],[\"apps\",\"forms\",\"disabled\"],[\"apps\",\"guests\",\"4.6.0\"],[\"apps\",\"impersonate\",\"4.0.0\"],[\"apps\",\"logreader\",\"6.0.0\"],[\"apps\",\"lookup_server_connector\",\"1.21.0\"],[\"apps\",\"mail\",\"disabled\"],[\"apps\",\"maps\",\"disabled\"],[\"apps\",\"markdownreadme\",\"1.0.1\"],[\"apps\",\"music\",\"disabled\"],[\"apps\",\"nextcloud_announcements\",\"5.0.0\"],[\"apps\",\"notes\",\"4.13.1\"],[\"apps\",\"notifications\",\"6.0.0\"],[\"apps\",\"oauth2\",\"1.21.0\"],[\"apps\",\"oidc_login\",\"disabled\"],[\"apps\",\"password_policy\",\"5.0.0-dev.0\"],[\"apps\",\"passwords\",\"2026.2.20\"],[\"apps\",\"photos\",\"6.0.0-dev.0\"],[\"apps\",\"polls\",\"8.6.3\"],[\"apps\",\"privacy\",\"5.0.0-dev.0\"],[\"apps\",\"profile\",\"1.2.0\"],[\"apps\",\"provisioning_api\",\"1.23.0\"],[\"apps\",\"recommendations\",\"6.0.0-dev.0\"],[\"apps\",\"related_resources\",\"4.0.0-dev.0\"],[\"apps\",\"richdocuments\",\"10.1.1\"],[\"apps\",\"serverinfo\",\"5.0.0-dev.0\"],[\"apps\",\"settings\",\"1.16.0\"],[\"apps\",\"sharebymail\",\"1.23.0\"],[\"apps\",\"spreed\",\"disabled\"],[\"apps\",\"support\",\"5.0.0\"],[\"apps\",\"survey_client\",\"5.0.0-dev.0\"],[\"apps\",\"systemtags\",\"1.23.0\"],[\"apps\",\"tasks\",\"0.17.1\"],[\"apps\",\"text\",\"7.0.0-dev.3\"],[\"apps\",\"theming\",\"2.8.0\"],[\"apps\",\"twofactor_backupcodes\",\"1.22.0\"],[\"apps\",\"twofactor_totp\",\"15.0.0-dev.0\"],[\"apps\",\"updatenotification\",\"1.23.0\"],[\"apps\",\"user_ldap\",\"1.24.0\"],[\"apps\",\"user_status\",\"disabled\"],[\"apps\",\"viewer\",\"6.0.0-dev.0\"],[\"apps\",\"weather_status\",\"disabled\"],[\"apps\",\"webhook_listeners\",\"1.5.0\"],[\"apps\",\"workflowengine\",\"2.15.0\"],[\"stats\",\"num_files\",784787],[\"stats\",\"num_users\",23],[\"stats\",\"num_storages\",43],[\"stats\",\"num_storages_local\",15],[\"stats\",\"num_storages_home\",25],[\"stats\",\"num_storages_other\",3],[\"stats\",\"num_comments\",201],[\"stats\",\"num_comment_markers\",3],[\"stats\",\"num_systemtags\",0],[\"stats\",\"num_systemtags_mappings\",0],[\"files_sharing\",\"num_shares\",44],[\"files_sharing\",\"num_shares_user\",22],[\"files_sharing\",\"num_shares_groups\",4],[\"files_sharing\",\"num_shares_link\",10],[\"files_sharing\",\"num_shares_link_no_password\",10],[\"files_sharing\",\"num_fed_shares_sent\",0],[\"files_sharing\",\"num_fed_shares_received\",0],[\"files_sharing\",\"permissions_0_1\",2],[\"files_sharing\",\"permissions_3_1\",1],[\"files_sharing\",\"permissions_4_1\",1],[\"files_sharing\",\"permissions_4_3\",1],[\"files_sharing\",\"permissions_0_13\",1],[\"files_sharing\",\"permissions_3_17\",6],[\"files_sharing\",\"permissions_0_19\",1],[\"files_sharing\",\"permissions_3_19\",2],[\"files_sharing\",\"permissions_4_19\",1],[\"files_sharing\",\"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        },
        "systemtags": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": "logging"
        },
        "tasks": {
            "enabled": "[\"family\"]",
            "installed_version": "0.17.1",
            "types": ""
        },
        "text": {
            "enabled": "yes",
            "installed_version": "7.0.0-dev.3",
            "types": "dav"
        },
        "theming": {
            "backgroundMime": "image\/jpeg",
            "background_color": "#2d73be",
            "cachebuster": "6",
            "disable-user-theming": false,
            "enabled": "yes",
            "installed_version": "2.8.0",
            "primary_color": "#0082c9",
            "types": "logging",
            "url": "***REMOVED SENSITIVE VALUE***"
        },
        "twofactor_backupcodes": {
            "enabled": "yes",
            "installed_version": "1.22.0",
            "types": ""
        },
        "twofactor_totp": {
            "enabled": "yes",
            "installed_version": "15.0.0-dev.0",
            "types": ""
        },
        "updatenotification": {
            "announcementcenter": "6.3.0",
            "apporder": "0.14.0",
            "audioplayer": "3.1.0",
            "breezedark": "20.0.11",
            "bruteforcesettings": "2.1.0",
            "calendar": "6.2.1",
            "cms_pico": "1.0.20",
            "contacts": "8.3.5",
            "cookbook": "0.11.2",
            "core": "33.0.0.16",
            "cospend": "3.2.0",
            "deck": "1.8.3",
            "enabled": "yes",
            "external": "5.5.2",
            "files_markdown": "2.3.3",
            "files_zip": "2.3.0",
            "forms": "2.2.4",
            "guests": "4.6.0",
            "impersonate": "3.0.1",
            "installed_version": "1.23.0",
            "music": "1.8.1",
            "notes": "4.13.0",
            "notify_groups": "[\"admin\"]",
            "oidc_login": "1.5.1",
            "passwords": "2026.2.20",
            "polls": "8.6.3",
            "related_resources": "1.0.4",
            "richdocuments": "10.1.2",
            "spreed": "21.0.2",
            "tasks": "0.17.1",
            "types": "",
            "update_check_errors": 0
        },
        "user_ldap": {
            "background_sync_interval": "43200",
            "background_sync_offset": "0",
            "background_sync_prefix": "s01",
            "cleanUpJobOffset": "0",
            "configuration_prefixes": [
                "s01"
            ],
            "enabled": "yes",
            "installed_version": "1.24.0",
            "s01_lastChange": "1733756867",
            "s01has_memberof_filter_support": "",
            "s01home_folder_naming_rule": "attr:uid",
            "s01last_jpegPhoto_lookup": "0",
            "s01ldap_agent_password": "***REMOVED SENSITIVE VALUE***",
            "s01ldap_attributes_for_group_search": "",
            "s01ldap_attributes_for_user_search": "",
            "s01ldap_backup_host": "",
            "s01ldap_backup_port": "",
            "s01ldap_base": "o=bouvier,dc=localdomain",
            "s01ldap_base_groups": "ou=Groups,o=bouvier,dc=localdomain",
            "s01ldap_base_users": "ou=People,o=bouvier,dc=localdomain",
            "s01ldap_cache_ttl": "600",
            "s01ldap_configuration_active": "1",
            "s01ldap_default_ppolicy_dn": "",
            "s01ldap_display_name": "displayname",
            "s01ldap_dn": "",
            "s01ldap_dynamic_group_member_url": "",
            "s01ldap_email_attr": "mail",
            "s01ldap_experienced_admin": "0",
            "s01ldap_expert_username_attr": "uid",
            "s01ldap_expert_uuid_group_attr": "cn",
            "s01ldap_expert_uuid_user_attr": "uid",
            "s01ldap_ext_storage_home_attribute": "uid",
            "s01ldap_gid_number": "gidNumber",
            "s01ldap_group_display_name": "cn",
            "s01ldap_group_filter": "(&(|(objectclass=posixGroup)))",
            "s01ldap_group_filter_mode": "0",
            "s01ldap_group_member_assoc_attribute": "memberUid",
            "s01ldap_groupfilter_groups": "",
            "s01ldap_groupfilter_objectclass": "posixGroup",
            "s01ldap_host": "ldap:\/\/ldap.localdomain",
            "s01ldap_login_filter": "(&(|(objectclass=inetOrgPerson)(objectclass=posixAccount))(|(uid=%uid)(|(mailPrimaryAddress=%uid)(mail=%uid))))",
            "s01ldap_login_filter_mode": "1",
            "s01ldap_loginfilter_attributes": "",
            "s01ldap_loginfilter_email": "1",
            "s01ldap_loginfilter_username": "1",
            "s01ldap_nested_groups": "0",
            "s01ldap_override_main_server": "",
            "s01ldap_paging_size": "500",
            "s01ldap_port": "389",
            "s01ldap_quota_attr": "",
            "s01ldap_quota_def": "",
            "s01ldap_tls": "0",
            "s01ldap_turn_off_cert_check": "0",
            "s01ldap_turn_on_pwd_change": "0",
            "s01ldap_user_avatar_rule": "data:jpegPhoto",
            "s01ldap_user_display_name_2": "",
            "s01ldap_user_filter_mode": "0",
            "s01ldap_userfilter_groups": "",
            "s01ldap_userfilter_objectclass": "",
            "s01ldap_userlist_filter": "(|(objectclass=inetOrgPerson)(objectclass=posixAccount))",
            "s01use_memberof_to_detect_membership": "1",
            "types": "authentication"
        },
        "user_status": {
            "enabled": "no",
            "installed_version": "1.2.0",
            "types": ""
        },
        "viewer": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "types": ""
        },
        "weather_status": {
            "enabled": "no",
            "installed_version": "1.2.0",
            "types": ""
        },
        "webhook_listeners": {
            "enabled": "yes",
            "installed_version": "1.5.0",
            "types": "filesystem"
        },
        "workflowengine": {
            "enabled": "yes",
            "installed_version": "2.15.0",
            "types": "filesystem"
        }
    }
}

List of activated Apps

Enabled:
  - app_api: 33.0.0
  - calendar: 6.2.1
  - circles: 33.0.0
  - cloud_federation_api: 1.17.0
  - comments: 1.23.0
  - contacts: 8.4.1
  - cospend: 4.0.0
  - dashboard: 7.13.0
  - dav: 1.36.0
  - external: 8.0.0
  - federatedfilesharing: 1.23.0
  - files: 2.5.0
  - files_downloadlimit: 5.1.0-dev.0
  - files_external: 1.25.1
  - files_pdfviewer: 6.0.0-dev.0
  - files_reminders: 1.6.0
  - files_sharing: 1.25.2
  - files_trashbin: 1.23.0
  - files_versions: 1.26.0
  - files_zip: 2.3.0
  - firstrunwizard: 6.0.0-dev.0
  - guests: 4.6.0
  - impersonate: 4.0.0
  - logreader: 6.0.0
  - lookup_server_connector: 1.21.0
  - markdownreadme: 1.0.1
  - nextcloud_announcements: 5.0.0
  - notes: 4.13.1
  - notifications: 6.0.0
  - oauth2: 1.21.0
  - password_policy: 5.0.0-dev.0
  - passwords: 2026.3.20
  - photos: 6.0.0-dev.0
  - polls: 8.6.3
  - privacy: 5.0.0-dev.0
  - profile: 1.2.0
  - provisioning_api: 1.23.0
  - recommendations: 6.0.0-dev.0
  - related_resources: 4.0.0-dev.0
  - richdocuments: 10.1.2
  - serverinfo: 5.0.0-dev.0
  - settings: 1.16.0
  - sharebymail: 1.23.0
  - support: 5.0.0
  - survey_client: 5.0.0-dev.0
  - systemtags: 1.23.0
  - tasks: 0.17.1
  - text: 7.0.0-dev.3
  - theming: 2.8.0
  - twofactor_backupcodes: 1.22.0
  - twofactor_totp: 15.0.0-dev.0
  - updatenotification: 1.23.0
  - user_ldap: 1.24.0
  - viewer: 6.0.0-dev.0
  - webhook_listeners: 1.5.0
  - workflowengine: 2.15.0
Disabled:
  - activity: 6.0.0-dev.0 (installed 2.15.0)
  - admin_audit: 1.23.0
  - bruteforcesettings: 6.0.0-dev.0 (installed 2.1.0)
  - contactsinteraction: 1.14.1 (installed 1.3.0)
  - encryption: 2.21.0
  - federation: 1.23.0 (installed 1.9.0)
  - suspicious_login: 11.0.0-dev.0
  - twofactor_nextcloud_notification: 7.0.0
  - user_status: 1.13.0 (installed 1.2.0)
  - weather_status: 1.13.0 (installed 1.2.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

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exception","exception":"{\"class\":\"TypeError\",\"message\":\"strtolower(): Argument #1 ($string) must be of type string, string given\",\"code\":0,\"file\":\"/var/www/html/lib/private/Config/UserConfig.php:688\",\"trace\":\"#0 /var/www/html/lib/private/Config/UserConfig.php(688): strtolower('false')\\n#1 /var/www/html/apps/user_ldap/lib/User/DeletedUsersIndex.php(88): OC\\Config\\UserConfig->getValueBool('cbouvi', 'user_ldap', 'isDeleted')\\n#2 /var/www/html/apps/user_ldap/lib/User_LDAP.php(631): OCA\\User_LDAP\\User\\DeletedUsersIndex->isUserMarked('cbouvi')\\n#3 [internal function]: OCA\\User_LDAP\\User_LDAP->isUserEnabled('cbouvi', Object(Closure))\\n#4 /var/www/html/apps/user_ldap/lib/User_Proxy.php(67): call_user_func_array(Array, Array)\\n#5 /var/www/html/apps/user_ldap/lib/Proxy.php(153): OCA\\User_LDAP\\User_Proxy->walkBackends('cbouvi', 'isUserEnabled', Array)\\n#6 /var/www/html/apps/user_ldap/lib/User_Proxy.php(404): OCA\\User_LDAP\\Proxy->handleRequest('cbouvi', 'isUserEnabled', Array)\\n#7 /var/www/html/lib/private/User/User.php(470): OCA\\User_LDAP\\User_Proxy->isUserEnabled('cbouvi', Object(Closure))\\n#8 /var/www/html/lib/private/User/Session.php(319): OC\\User\\User->isEnabled()\\n#9 /var/www/html/lib/private/User/Session.php(593): OC\\User\\Session->completeLogin(Object(OC\\User\\User), Array, false)\\n#10 /var/www/html/lib/private/User/Session.php(308): OC\\User\\Session->loginWithPassword('cbouvi', '********')\\n#11 /var/www/html/lib/private/User/Session.php(407): OC\\User\\Session->login('cbouvi', '********')\\n#12 /var/www/html/apps/dav/lib/Connector/Sabre/Auth.php(84): OC\\User\\Session->logClientIn('cbouvi', '********', Object(OC\\AppFramework\\Http\\Request), Object(OC\\Security\\Bruteforce\\Throttler))\\n#13 /var/www/html/3rdparty/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php(103): OCA\\DAV\\Connector\\Sabre\\Auth->validateUserPass('cbouvi', '********')\\n#14 /var/www/html/apps/dav/lib/Connector/Sabre/Auth.php(196): Sabre\\DAV\\Auth\\Backend\\AbstractBasic->check(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#15 /var/www/html/apps/dav/lib/Connector/Sabre/Auth.php(109): OCA\\DAV\\Connector\\Sabre\\Auth->auth(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#16 /var/www/html/3rdparty/sabre/dav/lib/DAV/Auth/Plugin.php(179): OCA\\DAV\\Connector\\Sabre\\Auth->check(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#17 /var/www/html/3rdparty/sabre/dav/lib/DAV/Auth/Plugin.php(135): Sabre\\DAV\\Auth\\Plugin->check(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#18 /var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php(89): Sabre\\DAV\\Auth\\Plugin->beforeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#19 /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php(456): Sabre\\DAV\\Server->emit('beforeMethod:PR...', Array)\\n#20 /var/www/html/apps/dav/lib/Connector/Sabre/Server.php(212): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#21 /var/www/html/apps/dav/lib/Server.php(427): OCA\\DAV\\Connector\\Sabre\\Server->start()\\n#22 /var/www/html/apps/dav/appinfo/v2/remote.php(25): OCA\\DAV\\Server->exec()\\n#23 /var/www/html/remote.php(151): require_once('/var/www/html/a...')\\n#24 {main}\"}","CustomMessage":"Uncaught exception"},"id":"69c39b32e0720"}

Additional info

No response

[cbouvier]

Restarting (docker compose down && docker compose up -d) a couple times did restore the functionality. I had to restart once again because of too many apache -DFOREGROUND processes being launched and eating up all the CPU, making the system unresponsive. None of these issues ever happend with nextcloud:32

[skjnldsv]

Hi, thanks for the report!
That seems weird indeed 🤔
Since it's back into order, I'll close the ticket. In the future if it happens again, feel free to re-open!
Since it's an upgrade, maybe an issue with opcache or something 🤷

[ggyimesi81]

I'm getting exactly the same error on a self-hosted Debian 12 / PHP 8.2 (apache2 module) / MariaDB 10.11.14 instance, and I am also using LDAP. Restarting or reloading apache2 seems to fix the error for a while, but it spontaneously breaks again.

[cbouvier]

For the record, I switched to using the php-fpm image coupled with nginx, and my instance of Nextcloud is stable again. No more apache2 processes eating up all the CPU and preventing logins. It seemed related to the authentication through LDAP though : when a user logged in, it spawned an apache2 process that sometimes (not always) would consume 100% of a CPU and never yield back control. Hard to reproduce. And it does not seem to happen with fpm.

[ggyimesi81]

In my case, I disabled opcache in php.ini (removed "opcache.enabled=1") and that seemed to have resolved the issue, stable for 12 hours now. But it seems like a workaround and not a solution.

[pritorianz-git]

Environment:

• Nextcloud: 33.0.3 (AIO v13.0.3)
• LDAP backend: Samba AD (Samba 4.22.8)
• user_ldap: 1.24.0
• PHP: 8.3.x
• Database: PostgreSQL 18

Issue:
After container restore/recovery, all LDAP user requests fail with HTTP 500:
TypeError: strtolower(): Argument #1 ($string) must be of type string, string given at lib/private/Config/UserConfig.php#688

The root cause is in getValueBool() — when the key isDeleted does not exist in oc_preferences for a user, getTypedValue() returns PHP false (boolean) instead of a string. strtolower() then fails because it expects a string.

Affected line (UserConfig.php:688):

// Before (broken):
$b = strtolower($this->getTypedValue($userId, $app, $key, $default ? 'true' : 'false', $lazy, ValueType::BOOL));

// After (fixed):
$b = strtolower((string)$this->getTypedValue($userId, $app, $key, $default ? 'true' : 'false', $lazy, ValueType::BOOL));

Workaround:
Cast the return value to string before passing to strtolower(). Verified working in production.

This affects all LDAP users — local admin account works fine.