diff --git a/src/Newsletter/Entities/Newsletter_users.php b/src/Newsletter/Entities/Newsletter_users.php
index <HASH>..<HASH> 100644
--- a/src/Newsletter/Entities/Newsletter_users.php
+++ b/src/Newsletter/Entities/Newsletter_users.php
@@ -9,7 +9,7 @@ class Newsletter_users extends Model {
 
     public function getActivatedAttribute()
     {
-        return $this->activated_at->timestamp < 0 ? null : $this->activated_at;
+        return $this->activated_at && $this->activated_at->timestamp < 0 ? null : $this->activated_at;
     }
 
     public function subscriptions()
fix no timestamp sort in user