Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "filter_filter_custom" not found or invalid function name in /home/bvxhmkxm/public_html/wp-includes/class-wp-hook.php:353 Stack trace: #0 /home/bvxhmkxm/public_html/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters() #1 /home/bvxhmkxm/public_html/wp-includes/plugin.php(523): WP_Hook->do_action() #2 /home/bvxhmkxm/public_html/wp-content/themes/flatsome/woocommerce/single-product.php(30): do_action() #3 /home/bvxhmkxm/public_html/wp-includes/template-loader.php(132): include('/home/bvxhmkxm/...') #4 /home/bvxhmkxm/public_html/wp-blog-header.php(19): require_once('/home/bvxhmkxm/...') #5 /home/bvxhmkxm/public_html/index.php(17): require('/home/bvxhmkxm/...') #6 {main} thrown in /home/bvxhmkxm/public_html/wp-includes/class-wp-hook.php on line 353