Null pointer 30/7

error handling client message [C] 2F RequestMagicSkillUse
java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2Skill.getWeaponDependancy(L2Skill.java:
666)
        at net.sf.l2j.gameserver.model.L2PcInstance.useMagic(L2PcInstance.java:3
221)
        at net.sf.l2j.gameserver.clientpackets.RequestMagicSkillUse.runImpl(Requ
estMagicSkillUse.java:71)
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePa
cket.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)