Division by zero in ArrayTransformer

[kachar]

Parsing and transformig the rule FREQ=HOURLY;BYSETPOS=-1;BYHOUR=12 leads to warning because of division by zero.

Warning:  Division by zero in ../vendor/simshaun/recurr/src/Recurr/Transformer/ArrayTransformer.php on line 466

Seems this case is specific for HOURLY in combination with BYHOUR and BYSETPOS, it works fine for DAILY.

Var $timeSet seems to be empty array because of the condition at line 230.

if ($setPos < 0) {
    $dayPos  = floor($setPos / count($timeSet));
    $timePos = DateUtil::pymod($setPos, count($timeSet));
} else {
    $dayPos  = floor(($setPos - 1) / count($timeSet));
    $timePos = DateUtil::pymod(($setPos - 1), count($timeSet));
}

I admit there's not much sense in rrule defined like that, but exception might be more appropriate, than a warning.