$hold_info->{barcodes} = [ uniq map { defined $_->barcode && $_->item_group->id == $res_info->item_group_id  ? $_->barcode : () } @$items ];

       $hold_info->{barcodes} = [ uniq map { defined $_->barcode && $_->item_group && ( $_->item_group->id == $res_info->item_group_id )  ? $_->barcode : () } @$items ];