Hello Vincent, Upstream says there isn't enough information in the backtrace to say anything helpful about this. Could you take a look at <https://debbugs.gnu.org/58956> and consider supplying more information over there, please?
Also, are you able to reproduce this with 'emacs -q' (not -Q)? Currently we have no way to reproduce this, and you're the only person who's seen anything like this, so we'll probably have to move the severity back down to 'important'. -- Sean Whitton
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