diff --git a/src/MicroweberPackages/Cart/CartManager.php b/src/MicroweberPackages/Cart/CartManager.php
index 3addd09d354..0b87b9f7be8 100644
--- a/src/MicroweberPackages/Cart/CartManager.php
+++ b/src/MicroweberPackages/Cart/CartManager.php
@@ -409,6 +409,12 @@ public function update_item_qty($data)
         if (!isset($data['qty'])) {
             return array('error' => _e('Invalid data', true));
         }
+
+        $data['qty'] = intval($data['qty']);
+        if ($data['qty'] < 1) {
+            return array('error' => _e('Invalid product quantity', true));
+        }
+
         $data_fields = false;
 
         $cart = array();