Steamcraft

Writing network registry for dimension0 to NBT
java.lang.NullPointerException
	at flaxbeard.steamcraft.api.steamnet.SteamNetworkRegistry.writeToNBT(SteamNetwrokegistry.java:52)
	at flaxbeard.steamcraft.api.steamnet.data.SteamNetworkData.func_76187_b(steamNetworkData.java:32)
	at net.minecraft.world.storage.MapStorage.func_75747_a(SourceFile:87)
	at net.minecraft.world.storage.MapStorage.func_75744_a(SourceFile:75)
	at net.minecraft.world.WorldServer.func_73042_a(WorldServer.java:838)
	at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:801)
	at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:318)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:569)
	at net.minecraft.server.MinecraftServer.run(MinecaftServer.java:427)
	at net.minecraft.server.MinecraftServer$2.run(MinecaftServer.java:685)