@P.K.Dick - welcome to MobileRead.
Looks like you have an author set on one of your books which is causing the check to fall over. I would love to know exactly what case this is. The line of code above is where it is trying to take the author(s) stored in the calibre database for that particular book and turn them into a list. See if you can find out which book that is using a process of elimination and search restrictions to isolate it down and then give me the details so I can handle it in the plugin. Sort your books by author and visually scan down to see if anything obvious stands out, but it looks like some sort of corruption to me.
If you can't figure it out I will do a special build of the plugin for you that will print a log of the books as it processes them.
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