And I spoke too soon, the crash is actually caused by parsing of XML or HTML in libxml2 (crashed thread is #106). It might just be the set of books you are sending. One or more of them is causing a crash. So if you can repeat the crash send smaller subsets of the books to isolate which one is the problem. If you can find that I can try to replicate and investigate. And of course try without the extended plugin as well, as that does more things to books when sending them.
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