Unable to start a review, server sends 500 in DraftsController#create

This has happened 3 times today in this MR: meltano/meltano!465 (merged)

Every time I reply to a discussion and click "start a review", I get a 500 error from the server.

The way Frontend handles the error is not great either, it closes the textarea:

Screen_Recording_2019-03-07_at_17.39.53

Edited Mar 11, 2019 by Nick Thomas
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