Compatible with Force Sell by BeRocket

Hello,

I think it′s a great plugin and I don′t get problems with the most of my plugins (DIVI, WP-Rocket,…)

Only with with the plugin Force Sell by BeRocket it doesn′t work. When I add an articel to the cart that is linked with force sell the website loads until I get an 503 error

The page I need help with: [log in to see the link]