[boulanger]

lots of times i get this error in game server since 1811 version

[30.10.13 12:27:08:607] WARN base.EnchantSkillLearn: Not found enchant skill group id: -1!
[30.10.13 12:27:08:622] ERROR c2s.L2GameClientPacket: Client: IN_GAME IP: 77.65.66.36 Account: makgregor2 Player : Makrynus[274521131] - Failed running: [C] RequestExEnchantSkillInfoDetail - Server Version: 1811
java.lang.NullPointerException
at l2s.gameserver.model.base.EnchantSkillLearn.getCos t(EnchantSkillLearn.java:86)
at l2s.gameserver.network.l2.c2s.RequestExEnchantSkil lInfoDetail.runImpl(RequestExEnchantSkillInfoDetai l.java:144)
at l2s.gameserver.network.l2.c2s.L2GameClientPacket.r un(L2GameClientPacket.java:49)
at l2s.commons.net.nio.impl.MMOExecutableQueue.run(MM OExecutableQueue.java:39)
at java.util.concurrent.ThreadPoolExecutor.runWorker( Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (Unknown Source)
at java.lang.Thread.run(Unknown Source)