diff --git a/Classes/Backend/FormDataProvider/CategoryDefaultValueProvider.php b/Classes/Backend/FormDataProvider/CategoryDefaultValueProvider.php
index b7c67dc2..08e6363c 100644
--- a/Classes/Backend/FormDataProvider/CategoryDefaultValueProvider.php
+++ b/Classes/Backend/FormDataProvider/CategoryDefaultValueProvider.php
@@ -19,7 +19,7 @@ public function addData(array $result): array
     {
         if ($result['command'] !== 'new' ||
             $result['tableName'] !== 'sys_category' ||
-            $result['parentPageRow']['module'] !== 'blog') {
+            ($result['parentPageRow']['module'] ?? null) !== 'blog') {
             return $result;
         }