diff --git a/application/Order/OrderController.php b/application/Order/OrderController.php
index 5d464ac96..82af61dcd 100644
--- a/application/Order/OrderController.php
+++ b/application/Order/OrderController.php
@@ -70,7 +70,7 @@ class OrderController extends mfBaseController {
           $address_id = $address->parent_id;
         }
         foreach(UserModel::search(['address_id' => $address_id]) as $user) {
-          if(!array_key_exists($user, $users)) {
+          if(!array_key_exists($user->id, $users)) {
             $users[$user->id] = $user;
             $user_ids[] = $user->id;
           }