als-sdin edited a comment on issue #6215: __init__() got an unexpected keyword argument 'ignore_nan' URL: https://github.com/apache/incubator-superset/issues/6215#issuecomment-525592187 Please re-open. I just built the latest superset from scratch following CONTRIBUTING.md and this bug appeared.  I have done some investigating and found the culprit. Within _superset/viz.py_ the method `json_dumps` of class `BaseViz` calls `json.dumps` with the keyword argument `ignore_nan`. It should resolve to the **simplejson** package which accepts that keyword argument. Only `json.dumps` points to the builtin **json** library not **simplejson**. Removing the alias for **simplejson** rectifies the problem. I'm having a hard time understanding why the error occurs at all?? [Link to related Pull Request](https://github.com/apache/incubator-superset/pull/5490)
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