Crashing when rejoining a sever #107

Context

I have seem to run in to a
NullPointerException in EntitySubLevelUtil.getTrackingSubLevel() because entity is null

I was playing on the server with my friend without any problems, I discovered that the physics engine did not work with Leaves Be Gone mod, so I disabled that and everything worked fine we played for a few hours, and then when restarting the server and client I get this crash every time I try to connect

Loading in to single player works fine
But after joining and leaving a single player world the crash turns to a different error
The error is this.minecraft.player is null inside MultiPlayerGameMode.tick(), and Sable's punching.MultiPlayerGameModeMixin

And there are no logs that indicate a crash on the server side.

Crash Report

https://bytebin.lucko.me/MtvFUGcmTI - Before joining an leaving a single player world

https://bytebin.lucko.me/JhDh57O9HS - after joining and leaving a single player world