require C4::AuthoritiesMarc;
my $authorized_heading =
- C4::AuthoritiesMarc::GetAuthorizedHeading( { 'authid' => $authid } );
+ C4::AuthoritiesMarc::GetAuthorizedHeading( { 'authid' => $authid } ) || '';
return ($field->as_string('abcdefghijklmnopqrstuvwxyz') eq $authorized_heading);
}