diff --git a/opac/opac-addbybiblionumber.pl b/opac/opac-addbybiblionumber.pl
index 3ea34220fd..3dddcedcc2 100755
--- a/opac/opac-addbybiblionumber.pl
+++ b/opac/opac-addbybiblionumber.pl
@@ -189,7 +189,7 @@ if( $op && $op !~ /^cud-/ ) {
 
 if ($authorized) {
     for my $biblionumber (@biblionumbers) {
-        my $biblio = Koha::Biblios->find( $biblionumber );
+        my $biblio = Koha::Biblios->find($biblionumber) or next;
         push(
             @biblios,
             {   biblionumber => $biblionumber,
diff --git a/virtualshelves/addbybiblionumber.pl b/virtualshelves/addbybiblionumber.pl
index 69483d5dc1..a5e68d8295 100755
--- a/virtualshelves/addbybiblionumber.pl
+++ b/virtualshelves/addbybiblionumber.pl
@@ -188,7 +188,7 @@ if ( $op && $op !~ /^cud-/ ) {
 
 my @biblios;
 for my $biblionumber (@biblionumbers) {
-    my $biblio = Koha::Biblios->find( $biblionumber );
+    my $biblio = Koha::Biblios->find($biblionumber) or next;
     push(
         @biblios,
         {   biblionumber => $biblionumber,