[MC-165137] java.lang.NullPointerException: Tesselating liquid in world - Crash while loading some worlds because of a grass block

The bug

When I created a new world to test the snapshot, my game crashed instantly. I tried once more and it happend again. When looked into the crash report I saw that this is caused by grass blocks.

Stack trace

19w45a: crash-2019-11-07_19.02.09-client.txt

Description: Tesselating liquid in world

java.lang.NullPointerException: Tesselating liquid in world
	at dbs.a(SourceFile:39)
	at dnb.a(SourceFile:761)
	at dsr.a(SourceFile:129)
	at dpt.a(SourceFile:14)
	at dpt.c(SourceFile:26)
	at dqv.a(SourceFile:65)
	at dqu.a(SourceFile:73)
	at dsq$c$b.a(SourceFile:495)
	at dsq$c$b.a(SourceFile:432)
	at dsq$c.k(SourceFile:397)
	at dsq.a(SourceFile:179)
	at dqe.a(SourceFile:898)
	at dqe.a(SourceFile:1068)
	at dqa.a(SourceFile:720)
	at dqa.a(SourceFile:550)
	at dbd.d(SourceFile:932)
	at dbd.b(SourceFile:569)
	at net.minecraft.client.main.Main.main(SourceFile:199)