16:44:12 [VARNING] Failed to handle packet: java.lang.NullPointerException
java.lang.NullPointerException
        at buildcraft.energy.TileEngine.delete(TileEngine.java:184)
        at buildcraft.energy.BlockEngine.remove(BlockEngine.java:57)
        at net.minecraft.server.Chunk.a(Chunk.java:387)
        at net.minecraft.server.World.setRawTypeId(World.java:376)
        at net.minecraft.server.World.setTypeId(World.java:443)
        at org.bukkit.craftbukkit.block.CraftBlock.setTypeId(CraftBlock.java:88)

        at org.bukkit.craftbukkit.block.CraftBlockState.update(CraftBlockState.j
ava:115)
        at net.minecraft.server.ItemBlock.a(ItemBlock.java:83)
        at net.minecraft.server.ItemStack.placeItem(ItemStack.java:83)
        at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.j
ava:326)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:608)
        at net.minecraft.server.Packet15Place.handle(SourceFile:39)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:100)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:7
8)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:543)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)