diff --git a/typo3/sysext/backend/Classes/Tree/Pagetree/ExtdirectTreeCommands.php b/typo3/sysext/backend/Classes/Tree/Pagetree/ExtdirectTreeCommands.php
index 25713970ef574a5e73be3d68ed5a1a00a77e3b00..223809bef54a984a8373381695b0fc4cd1c6d2ca 100644
--- a/typo3/sysext/backend/Classes/Tree/Pagetree/ExtdirectTreeCommands.php
+++ b/typo3/sysext/backend/Classes/Tree/Pagetree/ExtdirectTreeCommands.php
@@ -358,7 +358,9 @@ class ExtdirectTreeCommands
         if (empty($mountPoints)) {
             $mountPoints = array(0);
         }
-        $mountPoints[] = (int)$GLOBALS['BE_USER']->uc['pageTree_temporaryMountPoint'];
+        if (!empty($GLOBALS['BE_USER']->uc['pageTree_temporaryMountPoint'])){
+            $mountPoints[] = (int)$GLOBALS['BE_USER']->uc['pageTree_temporaryMountPoint'];
+        }
         $mountPoints = array_unique($mountPoints);
         /** @var $userSettingsController \TYPO3\CMS\Backend\Controller\UserSettingsController */
         $userSettingsController = GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Controller\UserSettingsController::class);