Hello,
1) Problem caused by your custom code in the child theme functions.php http://prntscr.com/n3keng 2) If you want to use WP recommended version of MySQL is 5.6 or greater https://wordpress.org/about/requirements/ At this moment version is 5.5 http://prntscr.com/n3kcni Could you, please, contact your hosting provider and update MySQL to avoid problems?
Regards
