diff --git a/Koha/EDI.pm b/Koha/EDI.pm
index 4e730de286..54edf00aa7 100644
--- a/Koha/EDI.pm
+++ b/Koha/EDI.pm
@@ -898,7 +898,7 @@ sub _check_for_existing_bib {
         $isbn =~ s/\-//xmsg;
         if ( $isbn =~ m/(\d{13})/xms ) {
             my $b_isbn = Business::ISBN->new($1);
-            if ( $b_isbn && $b_isbn->is_valid ) {
+            if ( $b_isbn && $b_isbn->is_valid && $b_isbn->as_isbn10 ) {
                 $search_isbn = $b_isbn->as_isbn10->as_string( [] );
             }