Fatal error: Uncaught Error: Call to undefined function add_filter() in /users/robiniffert95/www/gustavguns/wp-content/plugins/contact-form-7/modules/disallowed-list.php:3
Stack trace:
#0 {main}
thrown in /users/robiniffert95/www/gustavguns/wp-content/plugins/contact-form-7/modules/disallowed-list.php on line 3