sub extract_biblionumber {
my ( $record ) = @_;
return if ref($record) ne 'MARC::Record';
- my ( $biblionumbertagfield, $biblionumbertagsubfield ) = C4::Biblio::GetMarcFromKohaField( 'biblio.biblionumber', '' );
+ my ( $biblionumbertagfield, $biblionumbertagsubfield ) = C4::Biblio::GetMarcFromKohaField( 'biblio.biblionumber' );
if( $biblionumbertagfield < 10 ) {
my $controlfield = $record->field( $biblionumbertagfield );
return $controlfield ? $controlfield->data : undef;