diff --git a/config/routes/annotations.yaml b/config/routes/annotations.yaml
index 892de9d5..bd9ea273 100644
--- a/config/routes/annotations.yaml
+++ b/config/routes/annotations.yaml
@@ -2,7 +2,7 @@ controllers:
     resource: ../../src/Controller/
     type: annotation
     prefix: '{_locale}'
-    
+
     defaults:
         _locale: '%kernel.default_locale%'
     requirements:
diff --git a/src/Controller/AdminPages/BaseAdminController.php b/src/Controller/AdminPages/BaseAdminController.php
index 366842eb..2b2e0f90 100644
--- a/src/Controller/AdminPages/BaseAdminController.php
+++ b/src/Controller/AdminPages/BaseAdminController.php
@@ -168,7 +168,7 @@ abstract class BaseAdminController extends AbstractController
         $form_options =  [
             'attachment_class' => $this->attachment_class,
             'parameter_class' => $this->parameter_class,
-            'disabled' => null !== $timeTravel_timestamp ? true : null,
+            'disabled' => null !== $timeTravel_timestamp ? true : false,
         ];
 
         //Disable editing of options, if user is not allowed to use twig...