Hello everyone! I am running Koha on a Debian Jessie server. I installed Koha following the "package" method and I just updated it to the latest version (19.05). Unfortunately, something went wrong. What I did: sudo apt update sudo apt upgrade sudo apt install koha-common #as suggested in the documentation The latter command triggered the update of thedatabase schema. A double check with sudo koha-upgrade-schema gave no error. I then reindexed both our libraries with: sudo koha-rebuild-zebra -v -f <library> And restarted koha-zebra, koha-sip, koha-plack. I am currently not able to see the frontpage nor to login in the backend (it gives my incorrect user/password). I checked the logs here: /var/log/koha/koha/opac-error.log And it gives my these errors: 404.pl: Use of uninitialized value in concatenation (.) or string at /usr/share/koha/lib/C4/Auth.pm line 551. opac-export.pl: Use of uninitialized value in numeric ne (!=) at /usr/share/koha/lib/C4/Ris.pm line 833. In particular, the error from 404.pl recurs many times. Any help or suggestion would be much appreciated! Thanks! Jacopo