Fixed.

backend/tests/Squidex.Infrastructure.Tests/Email/SmtpEmailSenderTests.cs

@@ -11,6 +11,7 @@ using Xunit;
 
 namespace Squidex.Infrastructure.Email
 {
+    [Trait("Category", "Dependencies")]
     public class SmtpEmailSenderTests
     {
         [Fact]

frontend/app/framework/angular/routers/router-2-state.ts

@@ -344,7 +344,7 @@ function cleanupParams(query: Params) {
         if (query.hasOwnProperty(key)) {
             const value = query[key];
 
-            if (Types.isNull(value) || Types.isUndefined(value)) {
+            if (Types.isNull(value) || Types.isUndefined(key)) {
                 delete query[key];
             }
         }