Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1 in /var/www/html/booking/module_booking.php:753 Stack trace: #0 /var/www/html/booking/module_booking.php(753): mysqli_query() #1 /var/www/html/booking/module_booking.php(205): displaybookingproduct() #2 /var/www/html/index.php(527): require('...') #3 {main} thrown in /var/www/html/booking/module_booking.php on line 753