could not restore pet data:
java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2PetDataTable.getPetData(L2PetDataTable.
java:91)
        at net.sf.l2j.gameserver.model.L2PetInstance.<init>(L2PetInstance.java:8
0)
        at net.sf.l2j.gameserver.model.L2PetInstance.restore(L2PetInstance.java:
563)
        at net.sf.l2j.gameserver.model.L2PetInstance.spawnPet(L2PetInstance.java
:72)
        at net.sf.l2j.gameserver.handler.itemhandlers.PetSummon.useItem(PetSummo
n.java:112)
        at net.sf.l2j.gameserver.clientpackets.UseItem.runImpl(UseItem.java:126)

        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)