Exception in thread "General Pool-90" java.lang.NullPointerException
        at javolution.util.FastMap$Entry.detach(Unknown Source)
        at javolution.util.FastMap$Entry.access$500(Unknown Source)
        at javolution.util.FastMap.removeShared(Unknown Source)
        at javolution.util.FastMap.remove(Unknown Source)
        at net.sf.l2j.gameserver.model.actor.knownlist.ObjectKnownList.removeKno
wnObject(ObjectKnownList.java:81)
        at net.sf.l2j.gameserver.model.actor.knownlist.CharKnownList.removeKnown
Object(CharKnownList.java:60)
        at net.sf.l2j.gameserver.model.actor.knownlist.AttackableKnownList.remov
eKnownObject(AttackableKnownList.java:30)
        at net.sf.l2j.gameserver.model.actor.knownlist.ObjectKnownList.forgetObj
ects(ObjectKnownList.java:188)
        at net.sf.l2j.gameserver.model.actor.knownlist.ObjectKnownList.updateKno
wnObjects(ObjectKnownList.java:99)
        at net.sf.l2j.gameserver.model.actor.knownlist.ObjectKnownList$KnownList
AsynchronousUpdateTask.run(ObjectKnownList.java:227)
        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)