diff --git a/classes/Modules/ShippingMethod/Model/CreateShipmentResult.php b/classes/Modules/ShippingMethod/Model/CreateShipmentResult.php
index 044071cd..f8c69574 100644
--- a/classes/Modules/ShippingMethod/Model/CreateShipmentResult.php
+++ b/classes/Modules/ShippingMethod/Model/CreateShipmentResult.php
@@ -12,9 +12,9 @@ class CreateShipmentResult
 {
   public bool $Success = false;
   public array $Errors = [];
-  public ?string $Label;
-  public ?string $ExportDocuments;
-  public ?string $TrackingNumber;
-  public ?string $TrackingUrl;
-  public ?string $AdditionalInfo;
+  public ?string $Label = null;
+  public ?string $ExportDocuments = null;
+  public ?string $TrackingNumber = null;
+  public ?string $TrackingUrl = null;
+  public ?string $AdditionalInfo = null;
 }
\ No newline at end of file