diff --git a/backend/src/Squidex/Config/Web/WebServices.cs b/backend/src/Squidex/Config/Web/WebServices.cs
index 419691402..718b33b94 100644
--- a/backend/src/Squidex/Config/Web/WebServices.cs
+++ b/backend/src/Squidex/Config/Web/WebServices.cs
@@ -46,6 +46,9 @@ namespace Squidex.Config.Web
             services.AddSingletonAs<LocalCacheMiddleware>()
                 .AsSelf();
 
+            services.AddSingletonAs<RequestExceptionMiddleware>()
+                .AsSelf();
+
             services.AddSingletonAs<RequestLogPerformanceMiddleware>()
                 .AsSelf();