Crash: Ticking entity 'java.lang.ArrayIndexOutOfBoundsException: 1'

Near x=0,z=0, create a Repeat mode command block with command:

1.13

data merge entity @e[type=ender_dragon,limit=1] {DragonPhase:4}

Then run

/summon ender_dragon

The game crashes either instantly or after some seconds.

Description: Ticking entity

java.lang.ArrayIndexOutOfBoundsException: 1
	at aze.f(SourceFile:71)
	at xn.k(SourceFile:68)
	at xn.j(SourceFile:63)
	at xn.c(SourceFile:24)
	at wy.n(SourceFile:238)
	at sc.m(SourceFile:1631)
	at sd.m(SourceFile:277)
	at aia.a(SourceFile:1520)
	at lr.a(SourceFile:718)
	at aia.g(SourceFile:1498)
	at aia.k(SourceFile:1388)
	at lr.k(SourceFile:551)
	at net.minecraft.server.MinecraftServer.D(SourceFile:626)
	at net.minecraft.server.MinecraftServer.C(SourceFile:554)
	at bzg.C(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)