WP Bakery front-end editor crashes

Hi there,

Whenever we use the front-end editor and try to save an element, it crashes and displays a grey page. We tried disabling all our plugins, but this doesn’t have any effect. See screen-recording: https://drive.google.com/file/d/1zbU24tibP3SAI9i6kuiPMLO3Q3RPn-kL/view

We’re all up-to-date on the theme, all our plugins, and the WordPress Core.

Please assist.

Thanks,
Marijn