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Dont know when or why these happen but i get them allot:
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Mar 6, 2008 5:04:26 PM net.sf.l2j.gameserver.model.L2Attackable calculateRewards
SEVERE: 
java.lang.NullPointerException
	at net.sf.l2j.gameserver.model.actor.stat.PcStat.addExpAndSp(PcStat.java:112)
	at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.addExpAndSp(L2PcInstance.java:9709)
	at net.sf.l2j.gameserver.model.L2Attackable.calculateRewards(L2Attackable.java:676)
	at net.sf.l2j.gameserver.model.L2Character.doDie(L2Character.java:1733)
	at net.sf.l2j.gameserver.model.actor.instance.L2NpcInstance.doDie(L2NpcInstance.java:2191)
	at net.sf.l2j.gameserver.model.L2Attackable.doDie(L2Attackable.java:448)
	at net.sf.l2j.gameserver.model.actor.instance.L2MonsterInstance.doDie(L2MonsterInstance.java:202)
	at net.sf.l2j.gameserver.model.actor.status.CharStatus.reduceHp(CharStatus.java:234)
	at net.sf.l2j.gameserver.model.actor.status.NpcStatus.reduceHp(NpcStatus.java:48)
	at net.sf.l2j.gameserver.model.L2Character.reduceCurrentHp(L2Character.java:6532)
	at net.sf.l2j.gameserver.model.L2Attackable.reduceCurrentHp(L2Attackable.java:422)
	at net.sf.l2j.gameserver.model.L2Attackable.reduceCurrentHp(L2Attackable.java:366)
	at net.sf.l2j.gameserver.handler.skillhandlers.Pdam.useSkill(Pdam.java:195)
	at net.sf.l2j.gameserver.model.L2Character.callSkill(L2Character.java:6218)
	at net.sf.l2j.gameserver.model.L2Character.onMagicHitTimer(L2Character.java:5918)
	at net.sf.l2j.gameserver.model.L2Character$MagicUseTask.run(L2Character.java:2148)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)

Mar 6, 2008 6:21:09 PM net.sf.l2j.gameserver.model.L2Character callSkill
WARNING: 
java.lang.NullPointerException
	at net.sf.l2j.gameserver.handler.skillhandlers.Pdam.useSkill(Pdam.java:238)
	at net.sf.l2j.gameserver.model.L2Character.callSkill(L2Character.java:6218)
	at net.sf.l2j.gameserver.model.L2Character.onMagicHitTimer(L2Character.java:5918)
	at net.sf.l2j.gameserver.model.L2Character$MagicUseTask.run(L2Character.java:2148)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)