js_composer update crashes homepage

Hi guys,

Running WP 4.9.1 with TravelWP. Today I updated the travel booking plugin and checked that front and back-end was working ok. Then I updated the WPBakery Page Builder and after that the homepage is no longer showing.

If I disable the js_composer the front page shows, but it doesn’t render the short codes.

I need your help urgently with fixing this.

What I have already tried:

1. Upgrading to WP 5.1 (makes is worse)
2. Upgrading all modules etc. (causes multiple modules to crash the site)

Now I’m back with WP 4.9.1 which seems to only freak out when I upgrade js_composer (which I am forced to, because it detactivates itself).

I have spend many hours on this and my client is getting frustrated (as am I), so your help would be highly appreciated.

If you need access to the admin etc. kindly let me know