java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
        at java.util.HashMap$KeyIterator.next(Unknown Source)
        at net.sf.l2j.gameserver.clientpackets.Say2.<init>(Say2.java:212)
        at net.sf.l2j.gameserver.PacketHandler.handlePacket(PacketHandler.java:277)
        at net.sf.l2j.gameserver.ClientThread.run(ClientThread.java:221)
java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2Character.useMagic(L2Character.java:2697)
        at net.sf.l2j.gameserver.model.L2PcInstance.useMagic(L2PcInstance.java:2627)
        at net.sf.l2j.gameserver.clientpackets.RequestMagicSkillUse.<init>(RequestMagicSkillUse.java:92)
        at net.sf.l2j.gameserver.PacketHandler.handlePacket(PacketHandler.java:248)
        at net.sf.l2j.gameserver.ClientThread.run(ClientThread.java:221)
java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2Clan.getLeaderId(L2Clan.java:132)
        at net.sf.l2j.gameserver.model.L2PcInstance.<init>(L2PcInstance.java:460)
        at net.sf.l2j.gameserver.ClientThread.loadCharFromDisk(ClientThread.java:332)
        at net.sf.l2j.gameserver.clientpackets.CharacterSelected.<init>(CharacterSelected.java:85)
        at net.sf.l2j.gameserver.PacketHandler.handlePacket(PacketHandler.java:153)
        at net.sf.l2j.gameserver.ClientThread.run(ClientThread.java:221)
java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2Clan.getLeaderId(L2Clan.java:132)
        at net.sf.l2j.gameserver.model.L2PcInstance.<init>(L2PcInstance.java:460)
        at net.sf.l2j.gameserver.ClientThread.loadCharFromDisk(ClientThread.java:332)
        at net.sf.l2j.gameserver.clientpackets.CharacterSelected.<init>(CharacterSelected.java:85)
        at net.sf.l2j.gameserver.PacketHandler.handlePacket(PacketHandler.java:153)
        at net.sf.l2j.gameserver.ClientThread.run(ClientThread.java:221)
java.lang.NullPointerException
        at net.sf.l2j.gameserver.handler.skillhandlers.Pdam.useSkill(Pdam.java:106)
        at net.sf.l2j.gameserver.model.L2Character.callSkill(L2Character.java:2934)
        at net.sf.l2j.gameserver.model.L2Character.onMagicUseTimer(L2Character.java:2829)
        at net.sf.l2j.gameserver.model.L2Character$MagicUseTask.run(L2Character.java:497)
        at java.util.TimerThread.mainLoop(Unknown Source)
        at java.util.TimerThread.run(Unknown Source)
java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2Clan.getLeaderId(L2Clan.java:132)
        at net.sf.l2j.gameserver.model.L2PcInstance.<init>(L2PcInstance.java:460)
        at net.sf.l2j.gameserver.ClientThread.loadCharFromDisk(ClientThread.java:332)
        at net.sf.l2j.gameserver.clientpackets.CharacterSelected.<init>(CharacterSelected.java:85)
        at net.sf.l2j.gameserver.PacketHandler.handlePacket(PacketHandler.java:153)
        at net.sf.l2j.gameserver.ClientThread.run(ClientThread.java:221)