Crash when creating world

I was generating a new world. It stopped at 48% because of a crash. The full crash report is attached to this ticket.

Encountered an unexpected exception
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException
	at net.minecraft.server.MinecraftServer.g_(SourceFile:392)
	at dir.a(SourceFile:116)
	at dir.d(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:501)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2272)
	at net.minecraft.server.MinecraftServer.g_(SourceFile:390)
	... 4 more
Caused by: java.lang.ArrayIndexOutOfBoundsException
	at it.unimi.dsi.fastutil.shorts.ShortArrays.grow(ShortArrays.java:265)
	at it.unimi.dsi.fastutil.shorts.ShortArrayList.grow(ShortArrayList.java:308)
	at it.unimi.dsi.fastutil.shorts.ShortArrayList.add(ShortArrayList.java:322)
	at bqx.a(SourceFile:61)
	at st.a(SourceFile:23)
	at bby.a(SourceFile:9)
	at cal.a(SourceFile:145)
	at bzn.a(SourceFile:117)
	at bzn.a(SourceFile:62)
	at bzn.a(SourceFile:19)
	at bzo.a(SourceFile:27)
	at bqe.a(SourceFile:64)
	at tf.a(SourceFile:14)
	at ta.a(SourceFile:35)
	at bqi.a(SourceFile:95)
	at th.a(SourceFile:61)
	at th.a(SourceFile:24)
	at agl$a.a(SourceFile:131)
	at agl$a$$Lambda$1543/573939342.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)