Hello:  I am  upgrading koha  from  version 3.6.0, whic work very well  to koha 3.10.0,  and now  when I try to add a new biblio,  the system gives this message: software error:Can't call method "fields" on an undefined value at /usr/share/koha/lib/C4/Biblio.pm line 2482. I guess that could be a corrupted data, but I would like to know is someone has had this same proble. Lic. Ramón Figueroa. National Library of Venezuela. Caracas.