[MC-124903] Random crash in snow biomes: java.lang.NullPointerException: Exception ticking world

The bug

It looks like the game is randomly crashing when you are near or in snow biomes.

18w06a: crash-2018-02-09_22.24.05-server.txt

Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
	at atw.a(SourceFile:207)
	at atw.a(SourceFile:136)
	at sa.k_(SourceFile:198)
	at net.minecraft.server.MinecraftServer.w(SourceFile:695)
	at net.minecraft.server.MinecraftServer.v(SourceFile:628)
	at cvl.v(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:533)
	at java.lang.Thread.run(Thread.java:748)

How to reproduce

Create a Ice Plains(12) superflat world.

minecraft:bedrock,2*minecraft:dirt,minecraft:grass_block;12;