diff --git a/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs b/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs
index ee0e01c41..2bfbb8834 100644
--- a/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs
+++ b/src/Squidex/Controllers/Api/Webhooks/WebhooksController.cs
@@ -110,7 +110,7 @@ namespace Squidex.Controllers.Api.Webhooks
         [HttpDelete]
         [Route("apps/{app}/schemas/{name}/webhooks/{id}")]
         [ApiCosts(1)]
-        public async Task<IActionResult> DeleteSchema(string app, string name, Guid id)
+        public async Task<IActionResult> DeleteWebhook(string app, string name, Guid id)
         {
             await CommandBus.PublishAsync(new DeleteWebhook { Id = id });
 
diff --git a/src/Squidex/Controllers/ControllerBase.cs b/src/Squidex/Controllers/ControllerBase.cs
index 57893de7f..d1fce5e8b 100644
--- a/src/Squidex/Controllers/ControllerBase.cs
+++ b/src/Squidex/Controllers/ControllerBase.cs
@@ -9,6 +9,7 @@
 using System;
 using Microsoft.AspNetCore.Mvc;
 using Squidex.Domain.Apps.Read.Apps;
+using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS.Commands;
 using Squidex.Pipeline;
 
@@ -20,6 +21,8 @@ namespace Squidex.Controllers
 
         protected ControllerBase(ICommandBus commandBus)
         {
+            Guard.NotNull(commandBus, nameof(commandBus));
+
             CommandBus = commandBus;
         }