Game crashes when trying to render a warden

The game crashes when a warden comes into view in any way.

How to reproduce:

1. Spawn a warden.

Stack trace:

java.lang.IndexOutOfBoundsException: Index (2) is greater than or equal to list size (2)
	at it.unimi.dsi.fastutil.ints.IntArrayList.getInt(IntArrayList.java:341)
	at fiu.a(SourceFile:527)
	at fiu.a(SourceFile:430)
	at fiz.a(SourceFile:121)
	at gsl$a.a(SourceFile:1083)
	at gsa$a.a(SourceFile:96)
	at gsa$a.a(SourceFile:85)
	at gsa$a.getBuffer(SourceFile:56)
	at hcp.a(SourceFile:45)
	at hcp.a(SourceFile:19)
	at gzj.a(SourceFile:115)
	at gzj.a(SourceFile:40)
	at gyg.a(SourceFile:162)
	at gyg.a(SourceFile:149)
	at grv.a(SourceFile:958)
	at grv.a(SourceFile:835)
	at grv.a(SourceFile:626)
	at fip.a(SourceFile:67)
	at grv.a(SourceFile:551)
	at grq.a(SourceFile:755)
	at grq.a(SourceFile:518)
	at frd.c(SourceFile:1351)
	at frd.f(SourceFile:935)
	at net.minecraft.client.main.Main.main(SourceFile:265)