diff --git a/controllers/admin/AdminStatsController.php b/controllers/admin/AdminStatsController.php
index d162c9244..218ccbc3f 100644
--- a/controllers/admin/AdminStatsController.php
+++ b/controllers/admin/AdminStatsController.php
@@ -995,7 +995,7 @@ class AdminStatsControllerCore extends AdminStatsTabController
     public static function getRevenue($dateFrom, $dateTo)
     {
         $result = Db::getInstance()->getValue(
-            'SELECT (SUM(o.`total_paid_tax_excl` / o.`conversion_rate`) - COALESCE(SUM(orr.`refunded_amount`), 0))
+            'SELECT (SUM(o.`total_paid_tax_excl` / o.`conversion_rate`) - IFNULL(SUM(orr.`refunded_amount`), 0))
             FROM `'._DB_PREFIX_.'orders` o
             LEFT JOIN `'._DB_PREFIX_.'order_return` orr ON orr.`id_order` = o.`id_order`
             WHERE o.`invoice_date` BETWEEN "'.pSQL($dateFrom).' 00:00:00" AND "'.pSQL($dateTo).' 23:59:59"'