iercan commented on issue #12766:
URL: https://github.com/apache/superset/issues/12766#issuecomment-768288306
Yet another
```
worker_1 | [2021-01-27 13:32:29,087: ERROR/ForkPoolWorker-1] Task
load_explore_json_into_cache[60028736-ba7e-49e2-8513-f4a66d63f6b1] raised
unexpected: TypeError("'NoneType' object does not support item assignment")
worker_1 | Traceback (most recent call last):
worker_1 | File
"/usr/local/lib/python3.7/site-packages/celery/app/trace.py", line 412, in
trace_task
worker_1 | R = retval = fun(*args, **kwargs)
worker_1 | File "/app/superset/app.py", line 116, in __call__
worker_1 | return task_base.__call__(self, *args, **kwargs)
worker_1 | File
"/usr/local/lib/python3.7/site-packages/celery/app/trace.py", line 704, in
__protected_call__
worker_1 | return self.run(*args, **kwargs)
worker_1 | File "/app/superset/tasks/async_queries.py", line 108, in
load_explore_json_into_cache
worker_1 | raise exc
worker_1 | File "/app/superset/tasks/async_queries.py", line 84, in
load_explore_json_into_cache
worker_1 | payload = viz_obj.get_payload()
worker_1 | File "/app/superset/viz.py", line 470, in get_payload
worker_1 | payload["data"] = self.get_data(df)
worker_1 | File "/app/superset/viz.py", line 2048, in get_data
worker_1 | df[col] = []
worker_1 | TypeError: 'NoneType' object does not support item assignment
```
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