diff --git a/app.js b/app.js
index a4e9bc7..cb16e8e 100644
--- a/app.js
+++ b/app.js
@@ -16,7 +16,8 @@ const corsWhitelist = [ "http://minis.walamana.de",
                         "https://walamana.de",
                         "localhost:80",
                         "http://localhost:80",
-                        "http://localhost:4200"]
+                        "http://localhost:4200",
+                        undefined]
 
 
 var bodyParser = require('body-parser')