I'm doing some world gen rcon / teleport player style for the least issues. I did simple cofh tpx to the nether and got this crash.
java.lang.NullPointerException: Cannot invoke "org.embeddedt.archaicfix.lighting.api.IChunkLighting.getCachedLightFor(net.minecraft.world.EnumSkyBlock, int, int, int)" because "this.curChunk" is null
https://gist.github.com/StoneLegion/1ab94ddc8e472928b04f1866d22fcf0c
Hope this is enough to help it was 7.4 in RC1 of 2.7 of GTNH
Thanks.