diff --git a/auth.py b/auth.py
index e59abed..41fdbad 100644
--- a/auth.py
+++ b/auth.py
@@ -272,11 +272,7 @@ def check_user_machine_and_register(nas_type, user, user_interface, nas_id, user
 
     if user_interface:
         if user_interface["user_pk"] != user["pk"]:
-            return (
-                False,
-                "Mac address registered on another user account",
-                "",
-            )
+            return (False, "Mac address registered on another user account")
 
         elif not user_interface["active"]:
             return (False, "Interface/Machine disabled")