public void CheckOffineParty(Player player)
        {
            List <GameSession> sessions = GetSessions();

            if (sessions.Count == 0)
            {
                GameServer.PartyManager.RemoveParty(this);
                return;
            }
            BroadcastPacketParty(PartyPacket.LogoutNotice(player.CharacterId));
            if (Leader == player)
            {
                FindNewLeader();
            }
        }