diff --git a/erp/shipment.go b/erp/shipment.go
index 921ad1e..3f2a59d 100644
--- a/erp/shipment.go
+++ b/erp/shipment.go
@@ -40,7 +40,7 @@ type ShipmentItem struct {
 	PiSerials        string     `json:"piSerials"`
 	InvoiceSerial    string     `json:"invoiceSerial"`
 	ContractDate     *time.Time `json:"contractDate"`
-	InvoiceDate      time.Time  `json:"invoiceDate"`
+	InvoiceDate      *time.Time `json:"invoiceDate"`
 	CustomName       string     `json:"customName"`
 	CustomShortName  string     `json:"customShortName"`
 	EstSailingDate   *time.Time `json:"estSailingDate"`