here's a pastebin with the crash log in it
https://pastebin.com/KHrC1w8M

I'm currently in the process of updating the mod, hopefully, this should fix your issues.

Fixed in the latest release. If you guys run into the same problem, please create another issue.

I'm encountering this as well. Logs: https://gist.github.com/WardenDrew/51c753cf80d9e19827cb04aff80b31ed

I'm encountering this as well now,

This problem started occurring in fabric-api-0.34.0+1.16
This problem does not occur if you stay on fabric-api-0.33.1+1.16, so a change in the Fabric API probably broke the mod.

Thanks for the mod!

Based on @tenguin 's info here's the changes to fabric API between those two versions: FabricMC/fabric@0.33.1+1.16...0.34.0+1.16

My money would be on the changes in this commit: FabricMC/fabric@68c5cbd