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 1 in /mnt/web517/b3/92/54358792/htdocs/tickets/function/sql.php:37
Stack trace:
#0 /mnt/web517/b3/92/54358792/htdocs/tickets/function/sql.php(37): mysqli->prepare()
#1 /mnt/web517/b3/92/54358792/htdocs/tickets/function/sql.php(102): sql_n()
#2 /mnt/web517/b3/92/54358792/htdocs/tickets/function/counttickets.php(4): sql()
#3 /mnt/web517/b3/92/54358792/htdocs/tickets/order/order2.php(7): getAvailableTicketNum()
#4 /mnt/web517/b3/92/54358792/htdocs/tickets/index.php(161): require_once('...')
#5 {main}
  thrown in /mnt/web517/b3/92/54358792/htdocs/tickets/function/sql.php on line 37