diff --git a/src/Squidex/Config/Web/WebServices.cs b/src/Squidex/Config/Web/WebServices.cs
index f95f5d4f5..7cbcc446d 100644
--- a/src/Squidex/Config/Web/WebServices.cs
+++ b/src/Squidex/Config/Web/WebServices.cs
@@ -50,7 +50,7 @@ namespace Squidex.Config.Web
                 .As<IContextProvider>();
 
             services.AddSingletonAs<ApiPermissionUnifier>()
-                .As<IClaimsTransformation>();
+                .AsOptional<IClaimsTransformation>();
 
             services.AddMvc(options =>
             {