diff --git a/app/assets/javascripts/app/lib/app/ajax.js.coffee b/app/assets/javascripts/app/lib/app/ajax.js.coffee
index 531d2a371..af78b81c5 100644
--- a/app/assets/javascripts/app/lib/app/ajax.js.coffee
+++ b/app/assets/javascripts/app/lib/app/ajax.js.coffee
@@ -37,6 +37,16 @@ class _Singleton
       detail = jqxhr.responseText
       if !status && !detail
         detail = 'General communication error, maybe internet is not available!'
+
+      # do not show any error message on wrong login
+      return if status is 422
+
+      # show human readable message
+      if status is 401
+        status = 'Access denied.'
+        detail = ''
+
+      # show error message
       new App.ErrorModal(
         message: 'StatusCode: ' + status
         detail:  detail