java.lang.NullPointerException: Exception getting block type in world

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java.lang.NullPointerException: Exception getting block type in world
at com.gollum.morepistons.common.block.BlockMorePistonsVanillaProxy.func_149726_b(BlockMorePistonsVanillaProxy.java:103)
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:655)
at net.minecraft.world.gen.structure.StructureComponent.func_151550_a(StructureComponent.java:541)
at net.minecraft.world.gen.structure.StructureVillagePieces$Village.func_151550_a(StructureVillagePieces.java:1698)
at tconstruct.world.village.ComponentToolWorkshop.func_74875_a(ComponentToolWorkshop.java:137)
at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:44)
at net.minecraft.world.gen.structure.MapGenStructure.func_75051_a(MapGenStructure.java:93)
at net.minecraft.world.gen.ChunkProviderFlat.func_73153_a(SourceFile:132)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1045)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:190)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199)
at net.minecraft.world.World.func_72964_e(World.java:419)
at net.minecraft.world.World.func_147439_a(World.java:345)
at biomesoplenty.common.world.WorldProviderSurfaceBOP.getTopBlockCoord(WorldProviderSurfaceBOP.java:41)
at biomesoplenty.common.world.WorldProviderSurfaceBOP.func_76566_a(WorldProviderSurfaceBOP.java:14)
at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:749)
at undefined.WorldServerOF.func_72963_a(WorldServerOF.java:80)
at net.minecraft.world.World.(World.java:260)
at net.minecraft.world.WorldServer.(WorldServer.java:97)
at undefined.WorldServerOF.(WorldServerOF.java:69)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:65)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:153)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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