Notice: Trying to access array offset on value of type null in /var/www/live/vobas/web/app/controllers/Reference.php on line 39

Fatal error: Uncaught TypeError: Argument 1 passed to Medoo\Medoo::quote() must be of the type string, null given, called in /var/www/live/vobas/web/app/models/Reference.php on line 34 and defined in /var/www/live/vobas/web/vendor/catfan/medoo/src/Medoo.php:696 Stack trace: #0 /var/www/live/vobas/web/app/models/Reference.php(34): Medoo\Medoo->quote() #1 /var/www/live/vobas/web/app/controllers/Reference.php(39): Reference_model->get_gallery() #2 /var/www/live/vobas/web/app/app.php(275): Reference->Detail_action() #3 /var/www/live/vobas/web/app/app.php(186): App->renderPage() #4 /var/www/live/vobas/web/public/index.php(39): App->run() #5 {main} thrown in /var/www/live/vobas/web/vendor/catfan/medoo/src/Medoo.php on line 696