502 Bad Gateway after update plugin

[Intendit]

Message: Hi!
I just updated Meta Box - Elementor Integrator and Meta Box AIO to the latest version. After this update I get a 502 Bad Gateway on the frontend.

If I deactivate Meta Box - Elementor Integrator, the site start working again.

I have Elementor Pro installed with the version: 3.7.2

I have done following:

1. deactiveted all the plugin's = site start working.
2. activeted one plungin after eachother and testing the front end. Everything works correct intil I active Meta Box - Elementor Integrator.