While it shouldn't be impacting anything, it's the only error I can associate with "provision paid services" cron hanging a few times a day.  By hanging I mean Blesta thinks it's running and it's indeed not, so I assume it died before updating log_cron.end_date. [2017-09-15 14:55:01] general.NOTICE: E_NOTICE: ob_flush(): failed to flush buffer. No buffer to flush {"code":8,"message":"ob_flush(): failed to flush buffer. No buffer to flush","file":"/path/to/blesta/app/controllers/cron.php",