diff --git a/htdocs/commande/card.php b/htdocs/commande/card.php
index 0fd061ac7ed..24af2adce15 100644
--- a/htdocs/commande/card.php
+++ b/htdocs/commande/card.php
@@ -659,7 +659,7 @@ if (empty($reshook))
 		}
 
 		$qty = GETPOST('qty' . $predef);
-		$remise_percent = GETPOST('remise_percent' . $predef);
+		$remise_percent = (GETPOST('remise_percent'.$predef) != '' ? GETPOST('remise_percent'.$predef) : 0);
 
 		// Extrafields
 		$extrafieldsline = new ExtraFields($db);