Release Notes
https://github.com/kiwidude68/calibr..._sync-v1.16.11
For some reason the "user friendly" goodreads error messages about things like an invalid book link were being hidden behind other code for the error dialog. At least now you will get a slightly more helpful message when that scenario breaks an action like Add to shelf.
Unfortunately this is all part of the pain of using what is almost an "internal" goodreads id in that their librarians don't care about preserving it and delete/recreate editions of books at will. I really don't want to release a plugin feature that would ultimately result in countless millions of calls to the goodreads website by the combined users of this plugin on a semi-regular basis. As don't forget you would have to re-run it on every book every week/month/year or whatever timeframe for maintenance you have for your library as any book edition linked could disappear at any time...
I'm in the same boat as the rest of you on this one - can be annoying but it is what it is.