diff --git a/typo3/sysext/core/Classes/Database/Query/Restriction/FrontendGroupRestriction.php b/typo3/sysext/core/Classes/Database/Query/Restriction/FrontendGroupRestriction.php
index 44e19c5..ad33d79 100644
--- a/typo3/sysext/core/Classes/Database/Query/Restriction/FrontendGroupRestriction.php
+++ b/typo3/sysext/core/Classes/Database/Query/Restriction/FrontendGroupRestriction.php
@@ -33,7 +33,12 @@ class FrontendGroupRestriction implements QueryRestrictionInterface
      */
     public function __construct(array $frontendGroupIds = null)
     {
-        $this->frontendGroupIds = $frontendGroupIds === null ? explode(',', $GLOBALS['TSFE']->gr_list) : $frontendGroupIds;
+		if(is_array($GLOBALS['TSFE']->gr_list)) {
+			$this->frontendGroupIds = $frontendGroupIds === null ? explode(',', $GLOBALS['TSFE']->gr_list) : $frontendGroupIds;
+		}
+		else {
+			$this->frontendGroupIds = [];
+		}
     }
 
     /**