diff --git a/typo3/sysext/backend/Classes/Form/Element/CheckboxToggleElement.php b/typo3/sysext/backend/Classes/Form/Element/CheckboxToggleElement.php
index 4fc4acb08e74a9908c8c5f29f344f7650ecda2f6..e1fbb90a4bcb4174c753fe5c3cb066c71803c922 100644
--- a/typo3/sysext/backend/Classes/Form/Element/CheckboxToggleElement.php
+++ b/typo3/sysext/backend/Classes/Form/Element/CheckboxToggleElement.php
@@ -73,7 +73,7 @@ class CheckboxToggleElement extends AbstractFormElement
             $disabled = true;
         }
         // Traversing the array of items
-        $items = $this->data['parameterArray']['fieldConf']['config']['items'];
+        $items = $this->data['parameterArray']['fieldConf']['config']['items'] ?? [];
 
         $numberOfItems = count($items);
         if ($numberOfItems === 0) {