Celery worker errors on uniq key integrity constraint

[ringods]

After my deployment of zenhub-charts 2 weeks ago, I didn't notice that my celery worker was not able to connect to Redis. I just solved that and the Celery worker kicked off.

But it errors almost immediately with:

[2017-12-28 15:32:00,792: ERROR/ForkPoolWorker-2] Task Periodic data update[7dfa3704-3213-431f-a50a-87b770def622] raised unexpected: IntegrityError('duplicate key value violates unique constraint "boards_issue_repo_id_number_39d7a007_uniq"\nDETAIL: Key (repo_id, number)=(1, 10) already exists.\n',)

Any idea what this could be?