ошибка в гс

люди кто знает иза чего это выходит:

java.lang.NullPointerException
at net.sf.l2j.gameserver.model.L2Party.recalculatePartyLevel(L2Party.ja
a:647)
at net.sf.l2j.gameserver.model.L2Party.removePartyMember(L2Party.java:2
6)
at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.leaveParty(L
PcInstance.java:5164)
at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.deleteMe(L2P
Instance.java:9360)
at net.sf.l2j.gameserver.network.L2GameClient$DisconnectTask.run(L2Game
lient.java:538)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Sourc
)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

deleteMe()
java.lang.NullPointerException
at net.sf.l2j.gameserver.model.L2Party.recalculatePartyLevel(L2Party.ja
a:647)
at net.sf.l2j.gameserver.model.L2Party.removePartyMember(L2Party.java:2
6)
at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.leaveParty(L
PcInstance.java:5164)
at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.deleteMe(L2P
Instance.java:9360)
at net.sf.l2j.gameserver.network.L2GameClient$DisconnectTask.run(L2Game
lient.java:538)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Sourc
)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

deleteMe()
java.lang.NullPointerException
at net.sf.l2j.gameserver.model.L2Party.recalculatePartyLevel(L2Party.ja
a:647)
at net.sf.l2j.gameserver.model.L2Party.removePartyMember(L2Party.java:2
6)
at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.leaveParty(L
PcInstance.java:5164)
at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.deleteMe(L2P
Instance.java:9360)
at net.sf.l2j.gameserver.network.L2GameClient$DisconnectTask.run(L2Game
lient.java:538)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Sourc
)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)