diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 471f72086..2d6fd7669 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -67,5 +67,7 @@ public function register(IRegistrationContext $context): void {
 
 		$context->registerMiddleware(WorkspaceAccessControlMiddleware::class);
 		$context->registerMiddleware(IsSpaceAdminMiddleware::class);
+		$context->registerMiddleware(IsGeneralManagerMiddleware::class);
 	}
+
 }
diff --git a/lib/Middleware/IsGeneralManagerMiddleware.php b/lib/Middleware/IsGeneralManagerMiddleware.php
index b36a66bb3..346899770 100644
--- a/lib/Middleware/IsGeneralManagerMiddleware.php
+++ b/lib/Middleware/IsGeneralManagerMiddleware.php
@@ -52,7 +52,7 @@ public function beforeController($controller, $methodName): void {
 		return;
 	}
 
-	public function afterException($controller, $methodName, Exception $exception): void {
+	public function afterException($controller, $methodName, Exception $exception): JSONResponse {
 		if ($exception instanceof AccessDeniedException) {
 			return new JSONResponse([
 				'status' => 'forbidden',