Warning: Trying to access array offset on value of type bool in P:\Inetpub\vhosts\toothillschool.co.uk\httpdocs\ajax\ajax_course_profile.php on line 10

Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, bool given in P:\Inetpub\vhosts\toothillschool.co.uk\httpdocs\ajax\ajax_course_profile.php:11 Stack trace: #0 {main} thrown in P:\Inetpub\vhosts\toothillschool.co.uk\httpdocs\ajax\ajax_course_profile.php on line 11