Hello,
We have disabled the third-party plugins on your staging site that do not come bundled with our theme and don’t see the compatibility problem with PHP 7.2. Enable your third-party plugins one by one to find out which one is the reason of your problem. Seems one of them or maybe few of them do not support PHP 7.2 and you will need to contact plugins author to fix it.
First of all check WooCommerce Memberships because it gives fatal error https://prnt.sc/libefe and Menu – Visibility control for menu items https://prnt.sc/libjxh
Regards