diff --git a/tools/viewlog.pl b/tools/viewlog.pl
index 4e8a2c3cf3..f8463c0be1 100755
--- a/tools/viewlog.pl
+++ b/tools/viewlog.pl
@@ -90,7 +90,7 @@ if ( $src eq 'circ' ) {
 $template->param(
     debug => $debug,
     C4::Search::enabled_staff_search_views,
-    subscriptionsnumber => CountSubscriptionFromBiblionumber($input->param('object')),
+    subscriptionsnumber => CountSubscriptionFromBiblionumber(scalar $input->param('object')),
     object => $object,
 );