Tab completing advancement (any?) key with trailing space errors

/advancement grant md_5 only minecraft: 

r.MinecraftServer	Error executing task
java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 1
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
	at i.a(SourceFile:138)
	at net.minecraft.server.MinecraftServer.w(SourceFile:648)
	at net.minecraft.server.MinecraftServer.v(SourceFile:604)
	at cmd.v(SourceFile:152)
	at net.minecraft.server.MinecraftServer.run(SourceFile:509)
	at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
	at com.mojang.brigadier.CommandDispatcher.getCompletionSuggestions(CommandDispatcher.java:349)
	at rz.a(SourceFile:430)
	at ln.a(SourceFile:36)
	at ln.a(SourceFile:9)
	at ib$1.run(SourceFile:13)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at i.a(SourceFile:137)
	... 5 more