I have seen something like that when Kobo had sent a recommendation for a book I had an epub for. It would also need the driver to be configured to show recommendations. In that case, the recommended book matches a book in the library and gets put into a shelf with the real book. But, I'm sure I fixed that a while ago.
Why it led to an "oops" I don't know. It probably means the details stored for the recommendation have expired.
If I had a look at the database, it could help to work it out.
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