2nd crash

java.lang.NullPointerException: Exception getting block type in world
	at net.minecraft.world.World.func_147455_a(World.java:50534)
	at net.minecraft.world.chunk.Chunk.func_150806_e(Chunk.java:851)
	at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:660)
	at net.minecraft.world.World.func_147465_d(World.java:451)
	at factorization.common.WorldgenManager$2.set(WorldgenManager.java:79)
	at factorization.common.WorldgenManager$2.generation_implementation(WorldgenManager.java:167)
	at factorization.common.WorldgenManager$2.doGeneration(WorldgenManager.java:133)
	at factorization.common.WorldgenManager$2.generate(WorldgenManager.java:96)
	at cpw.mods.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:106)
	at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:280)
	at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)
	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 net.minecraft.world.World.func_147437_c(World.java:365)
	at biomesoplenty.common.world.WorldProviderSurfaceBOP.getTopBlockCoord(WorldProviderSurfaceBOP.java:42)
	at biomesoplenty.common.world.WorldProviderSurfaceBOP.func_76566_a(WorldProviderSurfaceBOP.java:14)
	at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:748)
	at net.minecraft.world.WorldServer.func_72963_a(WorldServer.java:715)
	at net.minecraft.world.World.<init>(World.java:260)
	at net.minecraft.world.WorldServer.<init>(WorldServer.java:97)
	at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:62)
	at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)