Game crashes if vanilla datapack disabled and you join the world

If u disable the vanilla datapack per command

/datapack disable vanilla

and close the world and join again the game crashes.

1.14 Pre-Release 5\: [^crash_launch_log.txt]

Description: Exception generating new chunk

java.lang.IllegalArgumentException: bound must be positive
	at java.util.Random.nextInt(Random.java:388)
	at cjf.a(SourceFile:181)
	at cji.a(SourceFile:147)
	at cff.a(SourceFile:91)
	at cfd$c.a(SourceFile:161)
	at cfd$c.<init>(SourceFile:98)
	at cfd.a(SourceFile:280)
	at cet.a(SourceFile:25)
	at ces$a.a(SourceFile:89)
	at bwy.a(SourceFile:187)
	at bxc.d(SourceFile:44)
	at bxc$$Lambda$1091/1810113242.doWork(Unknown Source)
	at bxc.a(SourceFile:199)
	at us.a(SourceFile:456)
	at us$$Lambda$2597/2012685150.apply(Unknown Source)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at us.a(SourceFile:450)
	at us$$Lambda$2563/666304119.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)
	at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
	at uu.b(SourceFile:57)
	at uu$$Lambda$2595/821384965.run(Unknown Source)
	at agk.e(SourceFile:83)
	at agk.a(SourceFile:123)
	at agk.run(SourceFile:91)
	at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)