fix new user login

users/models.py

@@ -122,6 +122,7 @@ class User(pirates_models.AbstractUser):
         if (
             not self._state.adding
             and not saved_by_auth
+            and hasattr(self, "_loaded_values")
             and self._loaded_values["is_staff"] != self.is_staff
         ):
             self.is_staff_based_on_group = False