diff --git a/src/Model/Aps.php b/src/Model/Aps.php
index <HASH>..<HASH> 100644
--- a/src/Model/Aps.php
+++ b/src/Model/Aps.php
@@ -84,7 +84,7 @@ class Aps
      *
      * @return Alert
      */
-    public function getAlert(): Alert
+    public function getAlert(): ?Alert
     {
         return $this->alert;
     }
Fix return type of getAlert

Alert is optional now.