diff --git a/app/controllers/messages.php b/app/controllers/messages.php
index 274e2eb27da78136780c83df7b669797c05a9c7d..5f8411741aa02f198196bad20ff436407946404d 100644
--- a/app/controllers/messages.php
+++ b/app/controllers/messages.php
@@ -265,7 +265,7 @@ class MessagesController extends AuthenticatedController {
 
                         $user = new MessageUser();
                         $user->setData(['user_id' => $member['user_id'], 'snd_rec' => 'rec']);
-                        $this->default_message->receivers[] = $user;
+                        $this->default_message->receivers->append($user);
                     }
                 }
             }