diff --git a/Classes/Hooks/ButtonBarHook.php b/Classes/Hooks/ButtonBarHook.php
index 16ec5167..02bac70f 100644
--- a/Classes/Hooks/ButtonBarHook.php
+++ b/Classes/Hooks/ButtonBarHook.php
@@ -34,16 +34,19 @@ public function getButtons(array $params, ButtonBar $buttonBar): array
             return $buttons;
         }
 
-        /** @var array{uid: int, doktype: int, module: string} $page */
+        /** @var array{uid: int, doktype?: int, module?: string}|null $page */
         $page = BackendUtility::getRecord(
             'pages',
             $queryParams['id'],
             'uid,module,doktype'
         );
+        if ($page === null) {
+            return $buttons;
+        }
 
         if (
-            (int)$page['doktype'] !== PageRepository::DOKTYPE_SYSFOLDER
-            || $page['module'] !== 'glossary'
+            (int)($page['doktype'] ?? 0) !== PageRepository::DOKTYPE_SYSFOLDER
+            || ($page['module'] ?? '') !== 'glossary'
         ) {
             return $buttons;
         }