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I looked at the books and they both share a problem in the spine data: they reference a file that doesn't actually exist in the ePub. The error you posted only happens when it tries to load a file that isn't present (which itself only happens on poorly constructed books) and examining the books you sent me supports that.
I'll add some code when I get a chance to silently handle this case, but it's a problem with the creator of the book.
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