Musket mod makes game crash as you leave the world / server

[Matthew2319]

Minecraft version

1.21

Mod loader you are using

Fabric

Musket Mod version

v1.5.4 for Fabric 1.21/1.21.1

Modpack info or mod list

n/a

The latest.log file and hs_err_pidXXX if exists

n/a

Issue description

After leaving a server or a world with the mod, the game will crash and a nullpointerexception crash report will be made.

Steps to reproduce (if reproducing the issue requires exact steps)

Have the mod on your mod files / server mod files (in my case im using an aternos server)
enter a world / server
leave said world / server
game crash