ConcurrentModificationException when running "scoreboard players reset *"

I don't know the exact conditions, but I created a dummy objective "Score", and gave both some entities and fake players some values in the objective, and then ran

scoreboard players reset * Score

and got

Couldn't execute command for Lorgon111: scoreboard players reset * Score
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
	at pc.b(SourceFile:308)
	at pc.c(SourceFile:166)
	at pc$$Lambda$474/598748983.run(Unknown Source)
	at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:119)
	at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:76)
	at bn.a(SourceFile:184)
	at re.c(SourceFile:868)
	at re.a(SourceFile:855)
	at kp.a(SourceFile:37)
	at kp.a(SourceFile:9)
	at hh$1.run(SourceFile:13)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at i.a(SourceFile:137)
	at net.minecraft.server.MinecraftServer.w(SourceFile:636)
	at net.minecraft.server.MinecraftServer.v(SourceFile:592)
	at clh.v(SourceFile:152)
	at net.minecraft.server.MinecraftServer.run(SourceFile:497)
	at java.lang.Thread.run(Thread.java:745)