[MC-63305] When rendering chunks, game crashes when loading ocean.

I was running in a newly generated world, and first I was getting chunk errors randomly. I kept running as the world was mosty, if not fully, generating and it looked as if I was coming upon an ocean. When it started rendering, my game crashed, closed, and I came here.

Description: Tesselating block model

java.lang.ArithmeticException: / by zero
	at chc.a(SourceFile:290)
	at cjs.a(SourceFile:138)
	at cjs.a(SourceFile:74)
	at cjs.a(SourceFile:43)
	at cjs.a(SourceFile:35)
	at cjq.a(SourceFile:62)
	at cmt.b(SourceFile:156)
	at cmm.a(SourceFile:71)
	at cmm.run(SourceFile:31)
	at java.lang.Thread.run(Unknown Source)