Time: 1/5/17 11:58 AM Description: Exception while updating neighbours

java.lang.NullPointerException: Exception while updating neighbours at net.minecraftforge.common.BiomeDictionary.containsType(BiomeDictionary.java:440) at net.minecraftforge.common.BiomeDictionary.isBiomeOfType(BiomeDictionary.java:261) at com.pam.harvestcraft.worldgen.BeehiveWorldGen.generate(BeehiveWorldGen.java:25) at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:120) at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1001) at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:974) at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:154) at net.minecraft.world.World.func_72964_e(World.java:303) at net.minecraft.world.World.func_175726_f(World.java:298) at net.minecraft.world.World.func_180495_p(World.java:842) at net.minecraft.block.BlockLiquid.func_176365_e(SourceFile:288) at net.minecraft.block.BlockStaticLiquid.func_189540_a(BlockStaticLiquid.java:26) at net.minecraft.block.state.BlockStateContainer$StateImplementation.func_189546_a(BlockStateContainer.java:463) at net.minecraft.world.World.func_180496_d(World.java:519) at net.minecraft.world.World.func_175685_c(World.java:470) at net.minecraft.world.World.func_175722_b(World.java:423) at net.minecraft.world.World.markAndNotifyBlock(World.java:368) at net.minecraft.world.World.func_180501_a(World.java:349) at net.minecraft.world.World.func_175656_a(World.java:408) at net.minecraft.block.BlockFalling.func_176503_e(BlockFalling.java:76) at net.minecraft.block.BlockFalling.func_180650_b(BlockFalling.java:44) at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:744) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:218) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698) at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) at java.lang.Thread.run(Unknown Source)