on the beta branch, attempting to load two of my characters results in this nullref: https://i.imgur.com/4trI3Vk.png
my third character, a level 5, did not encounter this and was able to enter game.
i had one mod installed, the extended item tooltips, and disabled it and still got the nullref for both characters
here's my save folder with all 3 characters: https://easyupload.io/9dblsy