error handling client message [C] 2F RequestMagicSkillUse
java.lang.NullPointerException
        at net.sf.l2j.gameserver.ai.AbstractAI.stopFollow(AbstractAI.java:693)
        at net.sf.l2j.gameserver.ai.AbstractAI.setIntention(AbstractAI.java:225)
        at net.sf.l2j.gameserver.model.L2Character.useMagic(L2Character.java:416
        at net.sf.l2j.gameserver.model.L2PcInstance.useMagic(L2PcInstance.java:3
        at net.sf.l2j.gameserver.clientpackets.RequestMagicSkillUse.runImpl(Requ
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePa
        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$ScheduledFutureTask.
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
        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)