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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/course/u61/public_html/submissions/submission06/scripts/process_checkout.php:63 Stack trace: #0 /home/course/u61/public_html/submissions/submission06/scripts/process_checkout.php(63): mysqli_query() #1 /home/course/u61/public_html/submissions/submission06/scripts/process_checkout.php(29): getExistingOrder() #2 /home/course/u61/public_html/submissions/submission06/scripts/process_checkout.php(5): displayReceipt() #3 {main} thrown in /home/course/u61/public_html/submissions/submission06/scripts/process_checkout.php on line 63