From b08468ecd73bdf9bc31c5f2d783b166c9a7fb25e Mon Sep 17 00:00:00 2001
From: bMancone <brice.mancone@prestashop.com>
Date: Mon, 20 Feb 2012 13:58:19 +0000
Subject: [PATCH] // Fixed #PSFV-521

---
 classes/Product.php | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/classes/Product.php b/classes/Product.php
index b63289ca1..bc4ff4be2 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -3960,12 +3960,16 @@ class ProductCore extends ObjectModel
 	 */
 	public function addStockMvt($quantity, $id_reason, $id_product_attribute = null, $id_order = null, $id_employee = null)
 	{
-		if (!$this->id)
-			return;
+		if (!$this->id || !$id_reason)
+			return false;
 
 		if ($id_product_attribute == null)
 			$id_product_attribute = 0;
 
+		$reason = new StockMvtReason((int)$id_reason);
+		if (!Validate::isLoadedObject($reason))
+			return false;
+
 		$quantity = abs((int)$quantity) * $reason->sign;
 
 		return StockAvailable::updateQuantity($this->id, $id_product_attribute, $quantity);