[BUGFIX] Do not access undefined property in PreviewRenderer

Resolves: #90554
Releases: master
Change-Id: I4cbdcadbec39766f87ca1561f6b2310e90c70ba5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63473


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Susanne Moog <look@susi.dev>

typo3/sysext/backend/Classes/Preview/StandardContentPreviewRenderer.php

@@ -215,8 +215,8 @@ class StandardContentPreviewRenderer implements PreviewRendererInterface, Logger
         $record = $item->getRecord();
         $this->getProcessedValue($item, 'starttime,endtime,fe_group,space_before_class,space_after_class', $info);
 
-        if (!empty($GLOBALS['TCA']['tt_content']['ctrl']['descriptionColumn']) && !empty($this->record[$GLOBALS['TCA']['tt_content']['ctrl']['descriptionColumn']])) {
-            $info[] = $this->record[$GLOBALS['TCA']['tt_content']['ctrl']['descriptionColumn']];
+        if (!empty($GLOBALS['TCA']['tt_content']['ctrl']['descriptionColumn']) && !empty($record[$GLOBALS['TCA']['tt_content']['ctrl']['descriptionColumn']])) {
+            $info[] = $record[$GLOBALS['TCA']['tt_content']['ctrl']['descriptionColumn']];
         }
 
         // Call drawFooter hooks