diff --git a/koha-tmpl/intranet-tmpl/prog/js/basket.js b/koha-tmpl/intranet-tmpl/prog/js/basket.js
index 671b9a0f45..e155eba36c 100644
--- a/koha-tmpl/intranet-tmpl/prog/js/basket.js
+++ b/koha-tmpl/intranet-tmpl/prog/js/basket.js
@@ -270,8 +270,8 @@ function delSingleRecord(biblionumber) {
     var arrayRecords = valCookie.split("/");
     var pos = jQuery.inArray(biblionumber, arrayRecords);
 
-    // the cart is empty, bail
-    if (pos <= 0) {
+    // if pos is -1, the cart is empty, bail
+    if (pos === -1) {
         return;
     }
 
diff --git a/koha-tmpl/opac-tmpl/bootstrap/js/basket.js b/koha-tmpl/opac-tmpl/bootstrap/js/basket.js
index 8239aee56c..fa795b8729 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/js/basket.js
+++ b/koha-tmpl/opac-tmpl/bootstrap/js/basket.js
@@ -236,8 +236,8 @@ function delSingleRecord(biblionumber) {
     var pos = jQuery.inArray(biblionumber, arrayRecords);
     arrayRecords.splice(pos, 1);
 
-    //if cart is empty, bail
-    if (pos <= -1) {
+    // if pos is -1, the cart is empty, bail
+    if (pos === -1) {
         return;
     }