[Koha] software error when user not superlibrarian tries to find a patron

Hello Koha community, We've found that when a librarian has some permissions (catalog + borrowers) but not superlibrarian and syspref IndependenBranches is turned on, we get a software error when this user not superlibrarian tries to find a patron within the patrons module: Can't call method "branchcode" on an undefined value at /home/www/our_koha/intranet/cgi-bin/members/member.pl line 56. Still, this user is able to find the same patron searched before if cardnumber or borrowernumber is used instead of name. We're working on Koha 17.11 + Debian 8. Has someone experienced this behavior and could give any clue? Should we report this as a bug? Thanks in advance!