Fatal error: Uncaught Error: Call to undefined function sanitize_key() in /home/helicos/prod-helilagon-com/wp-content/plugins/tutor/views/options/field-types/select.php:12 Stack trace: #0 {main} thrown in /home/helicos/prod-helilagon-com/wp-content/plugins/tutor/views/options/field-types/select.php on line 12