Warning: Undefined array key "user_id" in /var/www/submission/mistresstraining.com/public/courses/courses.php on line 57

Fatal error: Uncaught TypeError: getUserTrainingProgress(): Argument #1 ($user_id) must be of type int, null given, called in /var/www/submission/mistresstraining.com/public/courses/courses.php on line 57 and defined in /var/www/submission/mistresstraining.com/public/inc/functions/courses.php:118 Stack trace: #0 /var/www/submission/mistresstraining.com/public/courses/courses.php(57): getUserTrainingProgress() #1 {main} thrown in /var/www/submission/mistresstraining.com/public/inc/functions/courses.php on line 118