[JimmXinu]

@FaceDeer - Do you use "no_image_processing: true"? Because that's the only way I can replicate this issue.

You're right, it's an obscure little corner case. But it's pretty easy to put another try/except around the set_cover call and that seems to handle it.

At least as far as calibre metadata update goes. If you run with "no_image_processing: true", then you have to live with the occasional bad source image in your epub.

Please make sure that the attached version fixes the problem for you.

UPDATE Apr 25, 2013 - Remove obsolete beta versions