java.lang.NullPointerException: Exception ticking world

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java.lang.NullPointerException: Exception ticking world
at mine_spawner.MineSpawner.playerInteract(MineSpawner.java:91)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_155_MineSpawner_playerInteract_PlayerInteractEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at openmods.fakeplayer.OpenModsFakePlayer.rightClick(OpenModsFakePlayer.java:115)
at openmods.fakeplayer.OpenModsFakePlayer.equipWithAndRightClick(OpenModsFakePlayer.java:84)
at openblocks.common.tileentity.TileEntityBlockPlacer$1.usePlayer(TileEntityBlockPlacer.java:87)
at openmods.fakeplayer.FakePlayerPool$1.usePlayer(FakePlayerPool.java:30)
at openmods.fakeplayer.FakePlayerPool$1.usePlayer(FakePlayerPool.java:27)
at openmods.fakeplayer.FakePlayerPool$WorldPool.executeOnPlayer(FakePlayerPool.java:50)
at openmods.fakeplayer.FakePlayerPool.executeOnPlayer(FakePlayerPool.java:79)
at openmods.fakeplayer.FakePlayerPool.executeOnPlayer(FakePlayerPool.java:74)
at openblocks.common.tileentity.TileEntityBlockPlacer.placeBlock(TileEntityBlockPlacer.java:84)
at openblocks.common.tileentity.TileEntityBlockPlacer.func_145842_c(TileEntityBlockPlacer.java:59)
at openmods.block.OpenBlock.func_149696_a(OpenBlock.java:394)
at net.minecraft.world.WorldServer.func_147485_a(WorldServer.java:968)
at net.minecraft.world.WorldServer.func_147488_Z(WorldServer.java:955)
at undefined.WorldServerOF.func_72835_b(WorldServerOF.java:234)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:625)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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