public class DialogRequirementPlayerNotHasQuestRebirth : BaseDialogRequirement
{
    public override bool CheckRequirement(EntityPlayer player, EntityNPC talkingTo)
    {
        Quest newQuest = QuestClass.CreateQuest(ID);
        if (newQuest == null)
            return true;

        if (newQuest != null)
        {
            QuestClass questClass = newQuest.QuestClass;
            if (questClass != null)
            {
                for (int i = 0; i < player.QuestJournal.quests.Count; i++)
                {
                    if (player.QuestJournal.quests[i].CurrentState == Quest.QuestState.InProgress)
                    {
                        if (player.QuestJournal.quests[i].ID.ToLower() == ID.ToLower())
                        {
                            return false;
                        }
                    }
                }
                return true;
            }
        }

        return true;
    }
}