diff --git a/src/Bundle/ChillCustomFieldsBundle/Controller/CustomFieldsGroupController.php b/src/Bundle/ChillCustomFieldsBundle/Controller/CustomFieldsGroupController.php
index 7c1b0c5ea..acf223888 100644
--- a/src/Bundle/ChillCustomFieldsBundle/Controller/CustomFieldsGroupController.php
+++ b/src/Bundle/ChillCustomFieldsBundle/Controller/CustomFieldsGroupController.php
@@ -298,7 +298,7 @@ class CustomFieldsGroupController extends AbstractController
             ->setCustomFieldsGroup($customFieldsGroup);
 
         $builder = $this->get('form.factory')
-            ->createNamedBuilder(null, FormType::class, $customfield, [
+            ->createNamedBuilder('', FormType::class, $customfield, [
                 'method' => 'GET',
                 'action' => $this->generateUrl('customfield_new'),
                 'csrf_protection' => false,