> I’ve just seen this error when visiting > https://issues.guix.gnu.org/issue/35866 in mumi: Thank you for reporting this bug! This bug was triggered by a blank Subject header in one of the emails. I have fixed it now. See https://git.systemreboot.net/guile-email/commit/?id=641168f09dd117f053726593811bd0e35f6cc33e There is still the larger question of how guile-email should deal with blank header fields. But, I will address that question separately, in time. Meanwhile, I should set up some kind of "continuous testing" where all mails in guix-patches are periodically parsed and crashes reported to me, if any. Does mumi have any convenient API to fetch all emails from guix-patches? I will look at the mumi source code myself, but if you have any quick pointers, that would help. Thanks, Arun.