UserPermissions::getNextStageId

protected function getNextStageId(Type $type, int $stageId): ?int
{
	$stages = clone $type->getStages();
	reset($stages);
	$isPreviousStage = false;
	foreach($stages as $stage)
	{
		if($isPreviousStage)
		{
			return $stage->getId();
		}
		if($stage->getId() === $stageId)
		{
			$isPreviousStage = true;
		}
	}

	return null;
}