rmgpinto edited a comment on issue #12867:
URL: https://github.com/apache/superset/issues/12867#issuecomment-771088903
I have on config:
```
def auth_driver(driver, user):
pass
WEBDRIVER_AUTH_FUNC = auth_driver
```
And followed your steps and get on `superset-worker`:
```
Failed at generating thumbnail 'NoneType' object has no attribute
'set_window_size'
```
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