diff --git a/src/Squidex/Startup.cs b/src/Squidex/Startup.cs
index 6cab95e64..0f34095de 100644
--- a/src/Squidex/Startup.cs
+++ b/src/Squidex/Startup.cs
@@ -150,7 +150,7 @@ namespace Squidex
 
         private void MapAndUseFrontend(IApplicationBuilder app)
         {
-            if (!Environment.IsDevelopment())
+            if (Environment.IsDevelopment())
             {
                 app.UseDeveloperExceptionPage();
                 app.UseWebpackProxy();