Fatal error when editing custom post types

I am updating one of my sites and when I go to edit some posts I get this:

Fatal error: Uncaught TypeError: Argument 1 passed to AviaBuilder::handler_wp_dbx_post_sidebar() must be an instance of WP_Post, instance of stdClass given, called in /home/site/public_html/wp-includes/class-wp-hook.php on line 286 and defined in /home/site/public_html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/template-builder.class.php:398 

Stack trace: 
#0 /home/site/public_html/wp-includes/class-wp-hook.php(286): AviaBuilder->handler_wp_dbx_post_sidebar(Object(stdClass)) 
#1 /home/site/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array) 
#2 /home/site/public_html/wp-includes/plugin.php(465): WP_Hook->do_action(Array) 
#3 /home/site/public_html/wp-admin/edit-form-advanced.php(677): do_action('dbx_post_sideba...', Object(stdClass)) 
#4 /home/site/public_html/wp-admin/post.php(197): include('/home/site/p...') 
#5 {main} thrown in /home/site/public_html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/template-builder.class.php on line 398

I am not able to edit anything.