This is still happening on current master, 6f578aa894.
Thanks for sharing alps publicly, it's very cool and nice.
For some emails received (specifically a DMARC error report from google.com's server) I get a 500 error code in the alps web interface and this message on stderr:
2022-05-15T05:12:23Z ERROR template: message.html:189:29: executing "message.html" at <$text.PathString>: error calling PathString: value method git.sr.ht/~migadu/alps/plugins/base.IMAPPartNode.PathString called using nil *IMAPPartNode pointer
It's repeatable whenever viewing this message, maybe something wrong in the IMAP parser?
I am using alps built from master a few weeks ago,