diff --git a/application/PreorderBillingInvoice/PreorderBillingInvoice.php b/application/PreorderBillingInvoice/PreorderBillingInvoice.php
index 96b755201..0ca11cae6 100644
--- a/application/PreorderBillingInvoice/PreorderBillingInvoice.php
+++ b/application/PreorderBillingInvoice/PreorderBillingInvoice.php
@@ -6,6 +6,7 @@ use chillerlan\QRCode\Output\QROutputInterface;
 
 class PreorderBillingInvoice extends mfBaseModel {
     protected $forcestr = ["company", "zip", "email", "phone"];
+    private $owner;
     private $netowner;
     private $positions;
     private $pdf;