error handling client message [C] 04 Action
java.lang.NullPointerException
        at net.sf.l2j.gameserver.ai.AbstractAI.startFollow(AbstractAI.java:668)
        at net.sf.l2j.gameserver.ai.L2CharacterAI.onIntentionFollow(L2CharacterAI.java:412)
        at net.sf.l2j.gameserver.ai.AbstractAI.setIntention(AbstractAI.java:249)
        at net.sf.l2j.gameserver.ai.AbstractAI.setIntention(AbstractAI.java:205)
        at net.sf.l2j.gameserver.model.L2PcInstance.onAction(L2PcInstance.java:1719)
        at net.sf.l2j.gameserver.clientpackets.Action.runImpl(Action.java:80)
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePacket.java:56)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)