Could not add submission result to Leaderboard after migrate

Problem

Reproduce Step:

1. Create a competition
2. Upload a submission
3. Add current phase submission to leaderboard
4. Migrate
5. Add Final phase(which is migrate result to leaderboard)

Error

Could not find a competition

Backend logs

django.db.utils.IntegrityError: duplicate key value violates unique constraint "competitions_submission_owner_id_leaderboard_id_a7fc5304_uniq" DETAIL: Key (owner_id, leaderboard_id)=(76, 58) already exists.