diff --git a/src/Controller/Account/PersonalDataController.php b/src/Controller/Account/PersonalDataController.php
index 841b328..131ae0b 100644
--- a/src/Controller/Account/PersonalDataController.php
+++ b/src/Controller/Account/PersonalDataController.php
@@ -91,7 +91,18 @@ class PersonalDataController extends AbstractController
 
         if ($personalDataForm->isSubmitted() && $personalDataForm->isValid()) {
             try {
-                $this->apiClient->updatePersonalData($email, $password, $personalData);
+                $updateResult = $this->apiClient->updatePersonalData($email, $password, $personalData);
+
+                if ($updateResult instanceof Notification) {
+                    $this->logger->error('Personal data update rejected by BusProNet', [
+                        'email' => $user->getEmail(),
+                        'code' => $updateResult->code,
+                        'error' => $updateResult->message,
+                    ]);
+                    $this->addFlash('error', 'Deine persönlichen Daten konnten nicht aktualisiert werden. Bitte versuche es erneut.');
+
+                    return $this->redirectToRoute('app_personal_data');
+                }
 
                 // Invalidate cached bookings to ensure edit mode shows updated applicant data
                 $this->dataLoader->invalidateUserBookingCaches($user);