Self-hosted gitea + drone cron error

self-hosted gitea + drone
cron hourly error
{“branch”:“master”,“cron”:3,“error”:“Unprocessable Entity”,“level”:“warning”,“msg”:“cron: cannot find commit”,“repo”:“example/repo”,“time”:“2020-04-19T11:25:18Z”}

Which versions of Drone & Gitea are you running?

Gitea - 1.12.0
Drone - org.label-schema.build-date=2020-04-17T16:08:13Z

Bad idea use tag latest of gitea docker image. Set gitea version to stable - fix this error.