L2J Server

Client: [Character: Dolores[269259966] - Account: dolores - IP: 201.239.165.196] - Failed writing: 0c NpcInfo - L2J Server Version: Unsupported Custom Version. - DP Revision: Unsupported Custom Version. ; null
java.lang.NullPointerException
at com.l2jserver.gameserver.model.actor.L2Character.isInCombat(L2Character.java:4040)
at com.l2jserver.gameserver.network.serverpackets.AbstractNpcInfo$NpcInfo.writeImpl(AbstractNpcInfo.java:316)
at com.l2jserver.gameserver.network.serverpackets.L2GameServerPacket.write(L2GameServerPacket.java:63)
at org.mmocore.network.SelectorThread.putPacketIntoWriteBuffer(SelectorThread.java:577)
at org.mmocore.network.SelectorThread.prepareWriteBuffer(SelectorThread.java:549)
at org.mmocore.network.SelectorThread.writePacket(SelectorThread.java:468)
at org.mmocore.network.SelectorThread.run(SelectorThread.java:180)

which is the changelog for this error ..??

L2J Server Version: Unsupported Custom Version. - DP Revision: Unsupported Custom Version.

wth ?

try with clean sources first.