Problems with Quarry

[SchweizerAtze]

Hi everyone, i`ve got an big Problem with my Multiplayer-Server. I Ran the Server a Week with about 10-20 Players. Everything went good.

Then after a while someone did Build a Forcefield into to a Quarry, because there are Plugins like Logblock and Towny the Server crashed. I Figured out the Problem and forbid my Users to Build a ForceField into a Quarry.

Then everything went well for about 3-4 Hours and know The Server crashes as soon someone places a Quarry and start it.

For the First i fobid quarrys at all with WorldGuard, but i know tested with opping User like [buildCraft ¨and this Stuff. The Problem is still here. But then if i Restart the Server, he only crashes if a Player gets naer the Quarry or i connect (Standing right in front of it)

This is the Error i get at the Console, plz help me -.-

2012-11-10 20:55:07 [iNFO] Sending serverside check to: SchweizerAtze

2012-11-10 20:55:08 [sEVERE] java.lang.NullPointerException

2012-11-10 20:55:08 [sEVERE]    at org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:98)

2012-11-10 20:55:08 [sEVERE]    at buildcraft.factory.TileQuarry.doWork(TileQuarry.java:210)

2012-11-10 20:55:08 [sEVERE]    at buildcraft.api.PowerProvider.update(PowerProvider.java:50)

2012-11-10 20:55:08 [sEVERE]    at buildcraft.core.TileBuildCraft.q_(TileBuildCraft.java:54)

2012-11-10 20:55:08 [sEVERE]    at buildcraft.factory.TileQuarry.q_(TileQuarry.java:136)

2012-11-10 20:55:08 [sEVERE]    at net.minecraft.server.World.tickEntities(World.java:1190)

2012-11-10 20:55:08 [sEVERE]    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)

2012-11-10 20:55:08 [sEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

2012-11-10 20:55:08 [sEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

2012-11-10 20:55:08 [sEVERE] Unexpected exception

java.lang.NullPointerException

    at org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:98)

    at buildcraft.factory.TileQuarry.doWork(TileQuarry.java:210)

    at buildcraft.api.PowerProvider.update(PowerProvider.java:50)

    at buildcraft.core.TileBuildCraft.q_(TileBuildCraft.java:54)

    at buildcraft.factory.TileQuarry.q_(TileQuarry.java:136)

    at net.minecraft.server.World.tickEntities(World.java:1190)

    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)

    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)