Occurs in a current generated world, and when creating and joining a new world, server sided ticking on cave root generation. I somehow modified something and it crashed O_o

Stacktrace:

java.lang.NullPointerException at vazkii.quark.world.block.BlockRoots.nextState(BlockRoots.java:144) at vazkii.quark.world.block.BlockRoots.growAndReturnLastPos(BlockRoots.java:93) at vazkii.quark.world.block.BlockRoots.growMany(BlockRoots.java:80) at vazkii.quark.world.world.CaveRootGenerator.generate(CaveRootGenerator.java:35) at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:167) at net.minecraft.world.chunk.Chunk.populate(Chunk.java:1020) at net.minecraft.world.chunk.Chunk.populate(Chunk.java:985) at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:157) at net.minecraft.server.management.PlayerChunkMapEntry.providePlayerChunk(PlayerChunkMapEntry.java:126) at net.minecraft.server.management.PlayerChunkMap.tick(SourceFile:147) at net.minecraft.world.WorldServer.tick(WorldServer.java:227) at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:756) at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668) at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:185) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) at java.lang.Thread.run(Unknown Source)

config:

full config: here

crash report when crashing in an existing world:
client server

crash report when creating a new world (actually showing the stacktrace above):
server client

log: latest

I have flat bedrock generating that is one layer thick if that means something. I changed all the values except for flower drop chance and enabling.