diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index a8577ff..aad1870 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -55,7 +55,7 @@ final class BackendController extends Controller
      */
     public function setUpBackend(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
-        $head = $response->get('Content')->head;
+        $head = $response->data['Content']->head;
         $head->addAsset(AssetType::CSS, '/Modules/Knowledgebase/Theme/Backend/styles.css?v=1.0.0');
     }