diff --git a/rt-plugin-report.php b/rt-plugin-report.php
index 6edaafc..b845bfb 100644
--- a/rt-plugin-report.php
+++ b/rt-plugin-report.php
@@ -95,8 +95,8 @@ public function settings_page() {
 			$wp_latest = $this->check_core_updates();
 
 			// Refresh the cache, but only if nonce is valid and this is a fresh timestamp (not if the page has been refreshed with the timestamp still in the URL).
-			if ( isset( $_GET['clear_cache'] ) && isset( $_GET['_wpnonce'] ) && wp_verify_nonce( sanitize_key( $_GET['_wpnonce'] ), 'plugin_report_clear_cache' ) ) {
-				$new_timestamp  = intval( $_GET['clear_cache'] );
+			if ( isset( $_GET['clear_cache'] ) && isset( $_GET['_wpnonce'] ) && wp_verify_nonce( sanitize_key( wp_unslash( $_GET['_wpnonce'] ) ), 'plugin_report_clear_cache' ) ) {
+				$new_timestamp  = absint( wp_unslash( $_GET['clear_cache'] ) );
 				$last_timestamp = intval( get_site_transient( 'plugin_report_cache_cleared' ) );
 				if ( ! $last_timestamp || $new_timestamp > $last_timestamp ) {
 					$this->clear_cache();
@@ -360,9 +360,11 @@ private function assemble_plugin_report( $slug ) {
 					// Add the repo info to the report.
 					if ( isset( $returned_object ) ) {
 						if ( ! is_wp_error( $returned_object ) ) {
-							$report['repo_info'] = $returned_object;
-							// Cache the report.
-							set_site_transient( $cache_key, $report, self::CACHE_LIFETIME );
+							if ( isset( $returned_object->version ) ) {
+								$report['repo_info'] = $returned_object;
+								// Cache the report.
+								set_site_transient( $cache_key, $report, self::CACHE_LIFETIME );
+							}
 						} else {
 							// Store the error code and message in the report.
 							$report['repo_error_code']    = $returned_object->get_error_code();
@@ -492,7 +494,7 @@ private function render_table_row( $report ) {
 						$html     .= '<td class="' . esc_attr( $css_class ) . '">' . absint( $activation_status['active'] ) . '/' . absint( $activation_status['sites'] ) . '</td>';
 					}
 				} else {
-					if ( isset( $report['file_path'] ) ) {
+					if ( isset( $report['file_path'] ) && isset( $report['repo_info']->version ) ) {
 						$active    = is_plugin_active( $report['file_path'] ) ? __( 'Yes', 'plugin-report' ) : __( 'No', 'plugin-report' );
 						$css_class = is_plugin_active( $report['file_path'] ) ? self::CSS_CLASS_LOW : self::CSS_CLASS_HIGH;
 					}