[1.20.2 Waterfall] Exception when a player is disconnecting

[Brokkonaut]

Used Version

1.8.7-SNAPSHOT (build 526)
Waterfall version git:Waterfall-Bootstrap:1.20-R0.2-SNAPSHOT:b5977c9:539

What is happening?

Sometimes when a players disconnects (not every time) I get this exception in the log

Full Log

https://cpaste.de/juyelipowa.properties

[Phoenix616]

I doubt it's possible to do anything about that in the plugin, this looks like a timing issue with calling ServerConnection#sendData in the disconnect event