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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/course/u14/public_html/submissions/submission06/scripts/shopping_cart_process.php:56 Stack trace: #0 /home/course/u14/public_html/submissions/submission06/scripts/shopping_cart_process.php(56): mysqli_query() #1 /home/course/u14/public_html/submissions/submission06/scripts/shopping_cart_process.php(3): get_existing_order() #2 {main} thrown in /home/course/u14/public_html/submissions/submission06/scripts/shopping_cart_process.php on line 56