Hi David, Thank you for the fast answer. I dont think ISBD display is customized. Can you give me a hint on how can i identify items for records with invalid or non-existent home and current library values ? Best regards, Paulo Neto DSIGA / DPGI Tel. (+351) 21 844 2228 http://www.dgadr.gov.pt/ De: David Nind <mailto:david@davidnind.com> Enviada: 20 de outubro de 2023 17:55 Para: Paulo Neto <mailto:pneto@dgadr.pt> Cc: koha <mailto:koha@lists.katipo.co.nz> Assunto: Re: [Koha] errors on opac log Hi Paulo. I can't replicate on the current master with the sample data, using the development environment (KTD or koha-testing-docker). Some ideas (these probably don't have anything to do with the issue): - Have you customised the default ISBD display using the OPACISBD system preference? - Do you have any items for records with invalid or non-existent home and current library values? You may need to create a report to identify these. David Nind New Zealand On Fri, 20 Oct 2023 at 08:20, Paulo Neto <mailto:pneto@dgadr.pt> wrote: Hello, I am getting lots of these errors on opac log -opac-error.log- [Thu Oct 19 17:24:15.428577 2023] [cgi:error] [pid 19289] [client xxx.xxx.xxx:35920] AH01215: [Thu Oct 19 17:24:15 2023] op ac-ISBDdetail.pl: Use of uninitialized value $holdingbrtagf in string eq at /usr/share/koha/lib/C4/Biblio.pm line 755.: /us r/share/koha/opac/cgi-bin/opac/opac-ISBDdetail.pl How can i solve this ? Paulo Neto DGADR DSIGA / DPGI Tel. (+351) 21 844 2200 _______________________________________________ Koha mailing list http://koha-community.org mailto:Koha@lists.katipo.co.nz Unsubscribe: https://lists.katipo.co.nz/mailman/listinfo/koha