diff --git a/classes/Modules/Onlineshop/Data/OrderStatusUpdateRequest.php b/classes/Modules/Onlineshop/Data/OrderStatusUpdateRequest.php
index 093dae93..80281628 100644
--- a/classes/Modules/Onlineshop/Data/OrderStatusUpdateRequest.php
+++ b/classes/Modules/Onlineshop/Data/OrderStatusUpdateRequest.php
@@ -26,7 +26,7 @@ class OrderStatusUpdateRequest
     /**
      * @var Shipment[] list of shipments for this order
      */
-    public array $shipments;
+    public array $shipments = array();
 
     public function getTrackingNumberList() : array {
         $list = [];
@@ -45,4 +45,4 @@ class OrderStatusUpdateRequest
         }
         return $list;
     }
-}
\ No newline at end of file
+}