Minification conflict with Optima Express and Houzez

Minification scan is stuck on 12% with 500 Internal Server error on browser console.

Plugin conflict was performed and it pointed to two plugins:

Optima Express

https://pl.wordpress.org/plugins/optima-express/

Houzez Theme – Functionality

When one of them is enabled – Minification scan stops working.

Debug mode is enabled, but debug.log was not created.