Warning about undefined array key when accessing public shares

[arnowelzel]

Environment

• Nextcloud version: 33.0.6
• Draw.io app version: 4.3.5
• draw.io server (official or self-hosted URL): official
• Browser: Vivaldi
• OS: Linux

Describe the bug
When accessing a public share as guest, the server will log a warning.

Steps to reproduce

1. Create a diagram.
2. Share the diagram as public link.
3. Access the public link in a private tab or after logging out of Nextcloud as guest.

Expected behavior
The link can be opened and there are no warnings in the server log.

Actual behavior
When opening the link, the following warning is logged:

Time : July 21, 2026 - 8:25:46 AM UTC * IP : 2003:ec:d74f:5a00:48d3:8087:5295:3bef * User : -- * App : PHP * Method : GET * URL : /apps/drawio/edit?fileId=3138585&shareToken=G2NkCYnZk7d6f3E&isWB=false *
Reason : Undefined array key "drawio" at /var/www/nextcloud/lib/private/NavigationManager.php#432

Screenshots
(n/a)

Additional context
(n/a)

[solracsf]

Investigated: this is a Nextcloud core bug, not something the app can fix.

nextcloud/server#62361