user serializer validation bug

apps/authentication/api/v1/serializers/serializer.py

@@ -122,6 +122,8 @@ class UserSerializer(serializers.ModelSerializer):
                 if self.Meta.model.objects.filter(national_code=national_code).exists():
                     raise UserExistException()
         
+        return attrs
+
     def to_representation(self, instance):
         """ Custom output """