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That's a strange error, it indicates that the tags field in the cached metadata for those books has null values. I dont know how that could happen, perhaps the .metadata.calibre file on the device was corrupted? Although I find it hard to credit that the corruption would be that specific.
Is there any pattern to these books? Were they sent recently, of a particular type, anything else?
In any case, I have committed some code to sanitize the values before displaying them that should workaround it. You could also just resend the files, which should fix it.
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