diff --git a/gestioncof/views.py b/gestioncof/views.py
index c80eda6c..9c9dfd3c 100644
--- a/gestioncof/views.py
+++ b/gestioncof/views.py
@@ -92,9 +92,7 @@ class LoginExtView(DjangoLoginView):
     form_class = ExteAuthenticationForm
 
     def form_invalid(self, form):
-        # forms.non_field_errors() returns strings for some reason
-        non_field_errors = form.errors["__all__"].as_data()
-        for e in non_field_errors:
+        for e in form.non_field_errors().as_data():
             if e.code in ["has_clipper", "no_password"]:
                 return render(self.request, "login_error.html", {"error_code": e.code})
         return super().form_invalid(form)