New chart save fails

I’m evaluating Superset using the docker-compose quickstart on Linux, cloned from Git. I am unable to create new charts. However, opening an existing chart and saving it (with or without modifications) under a new name does work.

Expected results

Saving a new chart works.

Actual results

The save modal closes silently, but reopening shows the message “Failed to save slice”. No new chart is created. A 500 error appears in the log, but no stack trace is available and the PostgreSQL container’s /var/log/postgres is empty as logging does not seem to be configured.

superset_app             | 172.20.0.1 - - [09/Jun/2020 15:05:57] "POST /superset/explore/?action=saveas&slice_name&add_to_dash=noSave&goto_dash=false HTTP/1.1" 500 -
superset_app             | INFO:werkzeug:172.20.0.1 - - [09/Jun/2020 15:05:57] "POST /superset/explore/?action=saveas&slice_name&add_to_dash=noSave&goto_dash=false HTTP/1.1" 500 -

Screenshots

How to reproduce the bug

1. Create a new chart from the birth names sample set (I’ve seen the problem with both tables and big number/trendlines). In the screenshot below I adjusted the time range and group by and ran the query to validate, but those don’t appear strictly necessary.
2. Save the chart, entering a name. The modal closes but nothing else happens.
3. Reopen the save modal to see the error message.

Checklist

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven’t found one similar.

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[ananthagopi9381]

same this only I had another bug

when we overwrite the slice name the duplicates are created.

I want to stop this duplication.