Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 9 in /home/course/u39/public_html/submissions/submission06/scripts/checkoutProcess.php:55 Stack trace: #0 /home/course/u39/public_html/submissions/submission06/scripts/checkoutProcess.php(55): mysqli_query() #1 /home/course/u39/public_html/submissions/submission06/scripts/checkoutProcess.php(23): getExistingOrder() #2 /home/course/u39/public_html/submissions/submission06/scripts/checkoutProcess.php(2): displayReceipt() #3 /home/course/u39/public_html/submissions/submission06/pages/checkout.php(28): include('...') #4 {main} thrown in /home/course/u39/public_html/submissions/submission06/scripts/checkoutProcess.php on line 55