ponychicken opened a new issue, #35930: URL: https://github.com/apache/superset/issues/35930
### Bug description Just adding a new deckgl graph (here scatterplot) without any customizations. ### Screenshots/recordings _No response_ ### Superset version master / latest-dev ### Python version 3.10 ### Node version 16 ### Browser Chrome ### Additional context superset_app | 2025-10-31 15:22:30,817:ERROR:superset.views.error_handling:object of type 'int' has no len() superset_app | Traceback (most recent call last): superset_app | File "/app/.venv/lib/python3.10/site-packages/flask/app.py", line 1484, in full_dispatch_request superset_app | rv = self.dispatch_request() superset_app | File "/app/.venv/lib/python3.10/site-packages/flask/app.py", line 1469, in dispatch_request superset_app | return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) superset_app | File "/app/.venv/lib/python3.10/site-packages/flask_appbuilder/security/decorators.py", line 109, in wraps superset_app | return f(self, *args, **kwargs) superset_app | File "/app/superset/views/base_api.py", line 120, in wraps superset_app | duration, response = time_function(f, self, *args, **kwargs) superset_app | File "/app/superset/utils/core.py", line 1500, in time_function superset_app | response = func(*args, **kwargs) superset_app | File "/app/superset/utils/log.py", line 304, in wrapper superset_app | value = f(*args, **kwargs) superset_app | File "/app/superset/charts/data/api.py", line 237, in data superset_app | query_context = self._create_query_context_from_form(json_body) superset_app | File "/app/superset/utils/decorators.py", line 134, in wrapped superset_app | return f(*args, **kwargs) superset_app | File "/app/superset/charts/data/api.py", line 462, in _create_query_context_from_form superset_app | return ChartDataQueryContextSchema().load(form_data) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 792, in load superset_app | return self._do_load( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 951, in _do_load superset_app | result = self._deserialize( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 734, in _deserialize superset_app | value = self._call_and_store( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 570, in _call_and_store superset_app | value = getter_func(data) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 727, in getter superset_app | return field_obj.deserialize( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 374, in deserialize superset_app | output = self._deserialize(value, attr, data, **kwargs) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 809, in _deserialize superset_app | result.append(self.inner.deserialize(each, **kwargs)) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 374, in deserialize superset_app | output = self._deserialize(value, attr, data, **kwargs) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 691, in _deserialize superset_app | return self._load(value, partial=partial) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 667, in _load superset_app | valid_data = self.schema.load(value, unknown=self.unknown, partial=partial) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 792, in load superset_app | return self._do_load( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 951, in _do_load superset_app | result = self._deserialize( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 734, in _deserialize superset_app | value = self._call_and_store( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 570, in _call_and_store superset_app | value = getter_func(data) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/schema.py", line 727, in getter superset_app | return field_obj.deserialize( superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 374, in deserialize superset_app | output = self._deserialize(value, attr, data, **kwargs) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 809, in _deserialize superset_app | result.append(self.inner.deserialize(each, **kwargs)) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 374, in deserialize superset_app | output = self._deserialize(value, attr, data, **kwargs) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 896, in _deserialize superset_app | result.append(field.deserialize(each, **kwargs)) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 375, in deserialize superset_app | self._validate(output) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/fields.py", line 276, in _validate superset_app | self._validate_all(value) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/validate.py", line 82, in __call__ superset_app | r = validator(value) superset_app | File "/app/.venv/lib/python3.10/site-packages/marshmallow/validate.py", line 430, in __call__ superset_app | length = len(value) superset_app | TypeError: object of type 'int' has no len() ### Checklist - [x] I have searched Superset docs and Slack and didn't find a solution to my problem. - [x] I have searched the GitHub issue tracker and didn't find a similar bug report. - [x] I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section. -- This is an automated message from the Apache Git Service. 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