diff --git a/opac/opac-addbybiblionumber.pl b/opac/opac-addbybiblionumber.pl
index 23c03ab0de..a00ddba8ac 100755
--- a/opac/opac-addbybiblionumber.pl
+++ b/opac/opac-addbybiblionumber.pl
@@ -201,7 +201,7 @@ 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,
             {
diff --git a/virtualshelves/addbybiblionumber.pl b/virtualshelves/addbybiblionumber.pl
index 1d77b41187..cfbde23b68 100755
--- a/virtualshelves/addbybiblionumber.pl
+++ b/virtualshelves/addbybiblionumber.pl
@@ -192,7 +192,7 @@ 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,
         {