Fatal error site

I got a message saying my site has a fatal error, caused by Join.Chat.
I can’t seem to find the fault, the site seems fine, even in Chrome incognito!?
I’ve bought the plugin yesterday and my site is up to date with theme, plugins etc. It runs on Hello Theme, with Elementor Pro.

I got a list of details of the faults, should I post them here?

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