Deactivate plugin causes php error > Cron reschedule event error for hook

Whenever we deactivate the plugin, we see the following php error in the error_log on server:

Cron reschedule event error for hook: wp_fastest_cache_Preload, Error code: invalid_schedule, Error message: Event schedule does not exist., Data: {“schedule”:”everyfiveminute”,”args”:[],”interval”:300}

Not causing any functionality issues, but just wanted to let the dev know.

Thanks