Encountered Null Value.
java.lang.NullPointerException
        at net.sf.l2j.gameserver.ai.L2AttackableAI.thinkAttack(L2AttackableAI.java:292)
        at net.sf.l2j.gameserver.ai.L2AttackableAI.onEvtThink(L2AttackableAI.java:355)
        at net.sf.l2j.gameserver.ai.L2AttackableAI.run(L2AttackableAI.java:78)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)
        at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(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)