Thanks a ton. Adding `game=reset` to the URL did the trick!
Thanks for your responsiveness. I suppose the error only was related to me using an "old" save while the script had changed in between. But now I know how to handle it.
I'm getting ERR_TOO_MANY_REDIRECTS on https://chyoa.com/chapter/current-chapter.852601 (with all cookies cleared) when I'm logged in. This is due to the saved state I was in when the story was changed in between.
The story map can be seen here...