Warning: Undefined variable $gamefile in /var/app/current/jeopardyx/answerkey.php on line 7

Warning: Undefined variable $gamefile in /var/app/current/jeopardyx/answerkey.php on line 12

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/app/current/jeopardyx/answerkey.php on line 12

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 /var/app/current/jeopardyx/answerkey.php:19
Stack trace:
#0 /var/app/current/jeopardyx/answerkey.php(19): mysqli_query()
#1 {main}
  thrown in /var/app/current/jeopardyx/answerkey.php on line 19