diff --git a/classes/Cart.php b/classes/Cart.php
index 7d380889b..6636635eb 100644
--- a/classes/Cart.php
+++ b/classes/Cart.php
@@ -2632,6 +2632,9 @@ class CartCore extends ObjectModel
      */
     public static function desintifier($int, $delimiter = ',')
     {
+        if (!$int)
+            return;
+
         $delimiter_len = $int[0];
         $int = strrev(substr($int, 1));
         $elm = explode(str_repeat('0', $delimiter_len + 1), $int);
diff --git a/classes/Connection.php b/classes/Connection.php
index d44729a10..c14ee13fe 100644
--- a/classes/Connection.php
+++ b/classes/Connection.php
@@ -136,7 +136,7 @@ class ConnectionCore extends ObjectModel
 					'.Shop::addSqlRestriction(Shop::SHARE_CUSTOMER).'
 				ORDER BY `date_add` DESC';
         $result = Db::getInstance()->getRow($sql, false);
-        if (!$result['id_guest'] && (int)$cookie->id_guest) {
+        if (!isset($result['id_guest']) && (int)$cookie->id_guest) {
             // The old connections details are removed from the database in order to spare some memory
             Connection::cleanConnectionsPages();
 
diff --git a/controllers/admin/AdminProductsController.php b/controllers/admin/AdminProductsController.php
index 35879aea7..f5070a75b 100644
--- a/controllers/admin/AdminProductsController.php
+++ b/controllers/admin/AdminProductsController.php
@@ -2925,7 +2925,9 @@ class AdminProductsControllerCore extends AdminController
     public function renderForm()
     {
         // This nice code (irony) is here to store the product name, because the row after will erase product name in multishop context
-        $this->product_name = $this->object->name[$this->context->language->id];
+        if (Validate::isLoadedObject(($this->object))) {
+            $this->product_name = $this->object->name[$this->context->language->id];
+        }
 
         if (!method_exists($this, 'initForm'.$this->tab_display)) {
             return;