Koha expects (in koha-tmpl/intranet-tmpl/prog/en/modules/plugins/plugins-home.tt) for the plugin metadata to be a valid date (parsed using dt_from_string in Koha::DateUtils). This isn't ever checked beforehand though, so installing a plugin with a broken date (I built https://codeberg.org/tadzik/KohaBreaker/releases/tag/0.1-broken-date for demonstration) results in the following exception being thrown: Template process failed: undef error - The given date (2025-10-310) does not match the date format (iso) I'm not sure what would be the right time to verify the metadata structure – install time sounds like a good time? At the same time it'd be nice if the error wasn't this catastrophic, so that if such plugin were to be installed one way or another, it shouldn't blow up the whole plugins page.