return unless ($record && $record->fields());
foreach my $field ($record->fields()){
if ($field->tag()>=10){
my @subfields;
foreach my $subfield ($field->subfields()){
return unless ($record && $record->fields());
foreach my $field ($record->fields()){
if ($field->tag()>=10){
my @subfields;
foreach my $subfield ($field->subfields()){