"Retrieve metadata for PDF" fails with "an unexpected error occurred"

Reporting in case it's helpful. I understand completely that metadata retrieval for random Internet documents is a handy thing to have but will never be perfect.

Debug log D1582793861. Linux x64 (Crunchbang++, a Debian derivative, based on Debian 8.7). Zotero standalone It's failing on this document: (which does contain embedded text): https://americanfuturesiup.files.wordpress.com/2013/01/sontag-the-imagination-of-disaster.pdf

Happy to supply more information if it's helpful. Thank you for a wonderful piece of software!
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