diff --git a/typo3/sysext/backend/Classes/Preview/StandardContentPreviewRenderer.php b/typo3/sysext/backend/Classes/Preview/StandardContentPreviewRenderer.php
index e250c3e7ec9a877cbf19c01f5b999bd77d12b8e8..c07a3017bd7c76465b0956a5168617cce3985a13 100644
--- a/typo3/sysext/backend/Classes/Preview/StandardContentPreviewRenderer.php
+++ b/typo3/sysext/backend/Classes/Preview/StandardContentPreviewRenderer.php
@@ -335,7 +335,7 @@ class StandardContentPreviewRenderer implements PreviewRendererInterface, Logger
             $table = 'sys_category';
             $field = 'selected_categories';
         }
-        if (trim($record[$field]) === '') {
+        if (trim($record[$field] ?? '') === '') {
             return '';
         }
         $content = '';