diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 00cba2055f7..4ededdeacaf 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -624,7 +624,7 @@ class Commande extends CommonOrder
 			}
 
 			// If stock is decremented on validate order, we must reincrement it
-			if (!empty($conf->stock->enabled) && $conf->global->STOCK_CALCULATE_ON_VALIDATE_ORDER == 1)
+			if (!empty($conf->stock->enabled) && !empty($conf->global->STOCK_CALCULATE_ON_VALIDATE_ORDER) && $conf->global->STOCK_CALCULATE_ON_VALIDATE_ORDER == 1)
 			{
 				$result = 0;
 
@@ -810,7 +810,7 @@ class Commande extends CommonOrder
 		if ($this->db->query($sql))
 		{
 			// If stock is decremented on validate order, we must reincrement it
-			if (!empty($conf->stock->enabled) && $conf->global->STOCK_CALCULATE_ON_VALIDATE_ORDER == 1)
+			if (!empty($conf->stock->enabled) && !empty($conf->global->STOCK_CALCULATE_ON_VALIDATE_ORDER) && $conf->global->STOCK_CALCULATE_ON_VALIDATE_ORDER == 1)
 			{
 				require_once DOL_DOCUMENT_ROOT.'/product/stock/class/mouvementstock.class.php';
 				$langs->load("agenda");