diff --git a/install-dev/upgrade/php/add_column_order_state_deleted_if_not_exists.php b/install-dev/upgrade/php/add_column_order_state_deleted_if_not_exists.php
index 38e236249..c894d4947 100644
--- a/install-dev/upgrade/php/add_column_order_state_deleted_if_not_exists.php
+++ b/install-dev/upgrade/php/add_column_order_state_deleted_if_not_exists.php
@@ -29,7 +29,9 @@ function add_column_order_state_deleted_if_not_exists()
 {
 	$column = Db::getInstance()->executeS('SHOW FIELDS FROM `'._DB_PREFIX_.'order_state` LIKE "deleted"');
 	if (empty($column))
-		return Db::getInstance()->execute('ALTER TABLE `PREFIX_order_state` 
+		$res = Db::getInstance()->execute('ALTER TABLE `'._DB_PREFIX_.'order_state` 
 			ADD COLUMN `deleted` tinyint(1) UNSIGNED NOT NULL default "0" AFTER `paid`');
+	if (!$res)
+		return array('error' => Db::getInstance()->getNumberError(), 'msg' => Db::getInstance()->getMsgError());
 	return true;
 }