My magento cronjob stopped working. It gets executed from system. Checked that in the logs. But magento just shedules the cronjobs and don't execute them. Also the schedule_id of the cronjobs is always 0. Manually run the cron task gives me an execption. See images from cli and database. What could cause this issue ? And how to fix?
PHP 7 on ubuntu Magento 2.1.5