Sent this to our Programmer, we'll see what can be done!
Edit: This error indicates that the save file couldn't be migrated to a newer version. We highly suggest starting a new game and using "skip to new content" feature if you don't want to replay the same routes. Errors like this are to be expected while we are revamping old content, and while we did our best to avoid them, it's the issue of the way engine itself operates.