Client crash on Party match

Server side log like this
com.l2jserver.gameserver.network.serverpackets.L2GameServerPacket write
SEVERE: Client: [Character: -[268610703] - Account: - - IP: -] - Failed writing: PartySmallWindowAll ; 0
java.lang.ArrayIndexOutOfBoundsException: 0
    at java.util.concurrent.CopyOnWriteArrayList.get(Unknown Source)
    at java.util.concurrent.CopyOnWriteArrayList.get(Unknown Source)
    at com.l2jserver.gameserver.model.L2Party.getLeader(L2Party.java:994)
    at com.l2jserver.gameserver.model.AbstractPlayerGroup.getLeaderObjectId(AbstractPlayerGroup.java:72)
    at com.l2jserver.gameserver.network.serverpackets.PartySmallWindowAll.writeImpl(PartySmallWindowAll.java:39)
    at com.l2jserver.gameserver.network.serverpackets.L2GameServerPacket.write(L2GameServerPacket.java:107)
    at com.l2jserver.mmocore.SelectorThread.putPacketIntoWriteBuffer(SelectorThread.java:621)
    at com.l2jserver.mmocore.SelectorThread.prepareWriteBuffer(SelectorThread.java:589)
    at com.l2jserver.mmocore.SelectorThread.writePacket(SelectorThread.java:500)
    at com.l2jserver.mmocore.SelectorThread.run(SelectorThread.java:190)
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