[MC-93808] crash on approach to blaze spawner

In nether, cheats enabled (have only used keepInv, enchant command, and tp on this world), approaching a blaze spawner in a fortress. Just as I was rounding the corner to attack the blazes, the game crashed. I tried relaunching and it crashed before loading completely. Subsequent attempts behaved the same way. So now I can't launch that world at all it seems. :-/ Crash log file attached.

Description: Unexpected error

com.google.common.util.concurrent.UncheckedExecutionException: java.util.NoSuchElementException
	at com.google.common.util.concurrent.Futures.wrapAndThrowUnchecked(Futures.java:1437)
	at com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1423)
	at bxz.x(SourceFile:333)
	at bbz.a(SourceFile:2137)
	at bbz.a(SourceFile:2125)
	at bkf.a(SourceFile:632)
	at ek.l(SourceFile:380)
	at bkg.e(SourceFile:273)
	at bbz.s(SourceFile:1533)
	at bbz.as(SourceFile:942)
	at bbz.a(SourceFile:386)
	at net.minecraft.client.main.Main.main(SourceFile:122)
Caused by: java.util.NoSuchElementException
	at java.util.ArrayList$Itr.next(ArrayList.java:854)
	at lp.e(SourceFile:262)
	at ahn.e(SourceFile:911)
	at mm.e(SourceFile:353)
	at bxz$3.run(SourceFile:338)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at net.minecraft.server.MinecraftServer.a(SourceFile:1270)
	at net.minecraft.server.MinecraftServer.a(SourceFile:1281)
	... 10 more