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Fatal error: Uncaught TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in /home/course/u17/public_html/submissions/submission06/scripts/shoppingCartProcess.php:47 Stack trace: #0 /home/course/u17/public_html/submissions/submission06/scripts/shoppingCartProcess.php(47): mysqli_real_escape_string() #1 /home/course/u17/public_html/submissions/submission06/scripts/shoppingCartProcess.php(4): getExistingOrder() #2 {main} thrown in /home/course/u17/public_html/submissions/submission06/scripts/shoppingCartProcess.php on line 47