When joining a lan-world, an Invalid Player Data error is received and the player is kicked - the day length is 192000 if that matters
no crash logs are generated
reproduced by opening a lan world with /publish 25565, and having someone join

please specify minecraft and mod version you are getting crash with

1.17.1 Fabric

Sorry, I assumed at first you meant mod version as fabric/forge
ct-1.4 is the jar version

kk will look into it once i have free time

also happens on my server only on 1.4, 1.3 is fine, 1.17.1

on dedicated server?

possibly fixed in latest release, if not report here