Hello. I was really hoping to use JAS to fix spawns in TFC but I'm confused at the crash I keep getting when generating a new world. Sometimes I'm able to generate - most of the time I'm not.

Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
at net.minecraft.world.gen.structure.MapGenStructure.func_143027_a(MapGenStructure.java:242)
at net.minecraft.world.gen.structure.MapGenStructure.func_75048_a(MapGenStructure.java:104)
at jas.spawner.modern.spawner.biome.structure.StructureInterpreterOverworldStructures.isLocationStructure(StructureInterpreterOverworldStructures.java:101)
at jas.spawner.modern.spawner.biome.structure.StructureInterpreterOverworldStructures.areCoordsStructure(StructureInterpreterOverworldStructures.java:60)
at jas.spawner.modern.spawner.biome.structure.StructureHandler.getStructureSpawnList(StructureHandler.java:67)
at jas.spawner.modern.spawner.biome.structure.StructureHandlerRegistry.getSpawnListAt(StructureHandlerRegistry.java:82)
at jas.spawner.modern.spawner.creature.entry.BiomeSpawnListRegistry.getSpawnListEntryToSpawn(BiomeSpawnListRegistry.java:165)
at jas.spawner.modern.spawner.CustomSpawner.spawnCreaturesInChunks(CustomSpawner.java:110)
at jas.spawner.modern.spawner.SpawnerTicker.performSpawningInWorld(SpawnerTicker.java:77)
at jas.spawner.modern.spawner.SpawnerTicker.serverTick(SpawnerTicker.java:46)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_727_SpawnerTicker_serverTick_ServerTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at cpw.mods.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:260)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:536)
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)

What's confusing me is that there's no structures that I know of. The crash occurs regardless of whether the compat addon-1.2.0 is included or not. I'm not sure if it's structure related, setting related ..or just an outright incompatibility with TFC.

Full log

PS. It seems that loading the world that crashed on creation works.
Generate a new world = crash.
Restart Minecraft and load the world that just crashed = loads without a hitch.

The vanilla structure components are included inside JAS and not the compatibility add on as all players are considered always playing with the Overworld. in hindsight, that may not be a wise assumption.

Related to the Stronghold structure. Although the fault is non-obvious. Something internal to the Structure object I'm handling.

I will investigate further but I'll be busy the next few weeks.

Understood and thanks