When I try to submit a quiz I received that:
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[phpBB Debug] PHP Notice: in file /quiz.php on line 465: Undefined index: quiz_submit_min
[phpBB Debug] PHP Notice: in file /quiz.php on line 465: Undefined index: quiz_submit_max
[phpBB Debug] PHP Notice: in file /quiz.php on line 465: Undefined index: quiz_submit_max
[phpBB Debug] PHP Notice: in file /quiz.php on line 473: Undefined index: quiz_submit_min
[phpBB Debug] PHP Notice: in file /quiz.php on line 473: Undefined index: quiz_submit_max