Site is Experiencing a Technical Issue

Getting a technical issue after update, tried replacing theme files and manually replacing latest version of WP core files, still getting a weird error.

Error Details
=============
An error of type E_ERROR was caused in line 385 of the file /nas/content/live/clearcututah/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/class-post-css-management.php. Error message: Uncaught TypeError: aviaPostCssManagement::handler_wp_save_post(): Argument #2 ($post) must be of type WP_Post, null given, called in /nas/content/live/clearcututah/wp-includes/class-wp-hook.php on line 307 and defined in /nas/content/live/clearcututah/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/class-post-css-management.php:385
Stack trace:
#0 /nas/content/live/clearcututah/wp-includes/class-wp-hook.php(307): aviaPostCssManagement->handler_wp_save_post(0, NULL, false)
#1 /nas/content/live/clearcututah/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(true, Array)
#2 /nas/content/live/clearcututah/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#3 /nas/content/live/clearcututah/wp-includes/post.php(4673): do_action(‘save_post’, 0, NULL, false)
#4 /nas/content/live/clearcututah/wp-admin/includes/post.php(700): wp_insert_post(Array, false, false)
#5 /nas/content/live/clearcututah/wp-admin/includes/dashboard.php(547): get_default_post_to_edit(‘post’, true)
#6 /nas/content/live/clearcututah/wp-admin/includes/template.php(1401): wp_dashboard_quick_press(”, Array)
#7 /nas/content/live/clearcututah/wp-admin/includes/dashboard.php(268): do_meta_boxes(Object(WP_Screen), ‘side’, ”)
#8 /nas/content/live/clearcututah/wp-admin/index.php(203): wp_dashboard()
#9 {main}
thrown