diff --git a/opac/opac-ISBDdetail.pl b/opac/opac-ISBDdetail.pl
index fb7fc05bf5..86685f9239 100755
--- a/opac/opac-ISBDdetail.pl
+++ b/opac/opac-ISBDdetail.pl
@@ -178,7 +178,7 @@ my $res = GetISBDView({
 my $items = $biblio->items;
 while ( my $item = $items->next ) {
 
-    $can_item_be_reserved = $can_item_be_reserved || IsAvailableForItemLevelRequest($item, $patron, undef);
+    $can_item_be_reserved = $can_item_be_reserved || $patron && IsAvailableForItemLevelRequest( $item, $patron, undef );
 }
 
 if( $can_item_be_reserved || CountItemsIssued($biblionumber) || $biblio->has_items_waiting_or_intransit ) {
diff --git a/opac/opac-MARCdetail.pl b/opac/opac-MARCdetail.pl
index c42d73abf0..9b85bbbe1e 100755
--- a/opac/opac-MARCdetail.pl
+++ b/opac/opac-MARCdetail.pl
@@ -140,7 +140,7 @@ my $can_item_be_reserved = 0;
 $items->reset;
 
 while ( my $item = $items->next ) {
-    $can_item_be_reserved = $can_item_be_reserved || IsAvailableForItemLevelRequest($item, $patron, undef);
+    $can_item_be_reserved = $can_item_be_reserved || $patron && IsAvailableForItemLevelRequest( $item, $patron, undef );
 }
 
 if( $can_item_be_reserved || CountItemsIssued($biblionumber) || $biblio->has_items_waiting_or_intransit ) {