diff --git a/application/admin/library/Auth.php b/application/admin/library/Auth.php
index ed68db8..ab123a3 100644
--- a/application/admin/library/Auth.php
+++ b/application/admin/library/Auth.php
@@ -73,7 +73,7 @@ class Auth extends \fast\Auth
     public function logout()
     {
         $admin = Admin::get(intval($this->id));
-        if (!$admin) {
+        if ($admin) {
             $admin->token = '';
             $admin->save();
         }