Your Site is Experiencing a Technical Issue

Hello. I’m constantly getting fatal errors when creating a new page/post in WPBakery page builder (using php 8). Interface fails and I’m getting wordpress automated email .
The problem although is mentioned as fatal, seems that doesn’t break the website.
Please check the details

WordPress version 5.7.2
Current theme: Pro (version 4.1.5)
Current plugin: Fancy Facebook Comments (version 1.2.6)
PHP version 8.0.7

Error Details
=============
An error of type E_ERROR was caused in line 104 of the file /var/www/*****/********/*****/wp-content/plugins/fancy-facebook-comments/admin/class-fancy-facebook-comments-admin.php. Error message: Uncaught TypeError: Cannot access offset of type string on string in /var/www/*****/********/*****/wp-content/plugins/fancy-facebook-comments/admin/class-fancy-facebook-comments-admin.php:104
Stack trace:
#0 /var/www/*****/********/*****/wp-admin/includes/template.php(1389): Fancy_Facebook_Comments_Admin->meta_options_setup()
#1 /var/www/*****/********/*****/wp-admin/edit-form-advanced.php(711): do_meta_boxes()
#2 /var/www/*****/********/*****/wp-admin/post.php(206): require(‘…’)
#3 {main}
thrown`