[iridius]

I have been doing some Bulk Metadata editing, mostly extracting PDFs' first page as the cover, and sometimes, on some PDFs this causes Calibre to crash and close. I have found some culprits (manually) and simply deleted the book, but I wonder if there's a way to autoscan for damaged or whatever it is about some PDFs that cause this to happen, because my libraries are huge and I don't always find the culprits. This will happen even if I do it individually on the guilty books, so it's not a matter of bulk editing being the problem, as once the problem books are removed it works without a hitch.