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I am having the same issue (no metadata returned when ISBN is blank) and across multiple plugin sources. Here is some further detail:
75% of the time I get the same error as above.
10% of the time I can get a book via Amazon, tho it is always the audio book metadata which is not what I have. Author field contains multiple names.
10% of the time I also get two unrelated books (same ones each time) plus the one I am looking for.
5% of the time I get only those two unrelated books.
I've tried Amazon (Amazon plugin is configured to go to Amazon), Goodreads (really wants an ISBN), Google (error says too many requests tho I was only doing a single book), Fantastic Fiction (forbidden error there), and Storygraph plugins. Only Amazon seems to return any metadata if it gets through as per the above stats.
What is odd, is that when I imported several books, none of them had an ISBN number - that is very unusual. 99% of books I've imported into Calibre contain an ISBN or ASIN number - it looks almost like they were stripped out?
Plus even if I manually add an ISBN, the Calibre plugin still can't find the metadata, and returns the error.
Like the OP, I have customizations (user columns, some rules).
Last, I was on v9.6 and had the error. I upgraded to v9.8 and to the 2 updated Goodreads plugins, thinking it was me. Alas, I continue to have the error.
Any ideas on how to fix?
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