[MC-138845] Stack Overflow when user logs in

[08:34:36] [User Authenticator #7/INFO]: UUID of player Grendal_Khan is f79da768-18bd-483a-8957-4261053b45a3
[08:34:36] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.StackOverflowError: null
	at qe.b(SourceFile:308) ~[minecraft_server.18w44a.jar:?]
	at qe.g(SourceFile:372) ~[minecraft_server.18w44a.jar:?]
	at qe.f(SourceFile:349) ~[minecraft_server.18w44a.jar:?]

java -Xss320K -Xms8G -Xmx8G -jar minecraft_server.18w44a.jar nogui

It seems to have saved 2 crash reports.

Seriously, if this is simply just an out of memory error then I don't know what to do. RCon is no longer in use and I have already cut my datapack right back. The only thing left is to pretty much just not have a datapack.

See ~~MC-138286~~ for datapack.