diff --git a/src/BusProNet/Model/PersonalData.php b/src/BusProNet/Model/PersonalData.php
index 899ffbc..1675e4b 100644
--- a/src/BusProNet/Model/PersonalData.php
+++ b/src/BusProNet/Model/PersonalData.php
@@ -50,8 +50,8 @@ class PersonalData
             'titel' => $this->title,
             'vorname' => $this->firstName,
             'name' => $this->name,
-            'anschrift' => $this->address->toPayload(),
-            'kommunikation' => $this->communication->toPayload(),
+            'anschrift' => $this->address?->toPayload(),
+            'kommunikation' => $this->communication?->toPayload(),
             'sonstiges1' => $this->height,
             'sonstiges2' => $this->weight,
             'sonstiges3' => $this->shoeSize,