Install the KitchenSink plugin and you get: Template process failed: undef error - The given date (20-12-20) does not match the date format (iso) at /kohadevbox/koha/Koha/DateUtils.pm line 192. on /cgi-bin/koha/plugins/plugins-home.pl Because Koha/Plugin/Com/ByWaterSolutions/KitchenSink.pm: date_updated => "1900-01-01",
It's not coming from the KitchenSink plugin, I had another plugin with a wrong date: "20-12-20"