diff --git a/src/BusProNet/Security/Authenticator.php b/src/BusProNet/Security/Authenticator.php
index fdcd432..f7e266f 100644
--- a/src/BusProNet/Security/Authenticator.php
+++ b/src/BusProNet/Security/Authenticator.php
@@ -4,6 +4,7 @@ namespace App\BusProNet\Security;
 
 use App\BusProNet\ApiClient;
 use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
 use App\BusProNet\Model\CrmAttributes;
 use App\BusProNet\Model\PersonalData;
 use Psr\Log\LoggerInterface;
@@ -45,7 +46,7 @@ class Authenticator extends AbstractLoginFormAuthenticator implements Authentica
 
         try {
             $response = $this->apiClient->getPersonalData($email, $password);
-        } catch (ApiClientException $e) {
+        } catch (ApiClientException|ResponseParserException $e) {
             throw new CustomUserMessageAuthenticationException($e->getMessage());
         }
 
diff --git a/src/Controller/Booking/DownloadController.php b/src/Controller/Booking/DownloadController.php
index deef808..5daa983 100644
--- a/src/Controller/Booking/DownloadController.php
+++ b/src/Controller/Booking/DownloadController.php
@@ -3,6 +3,8 @@
 namespace App\Controller\Booking;
 
 use App\BusProNet\ApiClient;
+use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
 use App\BusProNet\Model\Notification;
 use Psr\Log\LoggerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -56,13 +58,16 @@ class DownloadController extends AbstractController
             'booking_id' => $id,
         ]);
 
-        $file = $this
-            ->apiClient
-            ->getDocuments($bpnUser->getEmail(), $bpnUser->getPassword(), $id, $type)
-        ;
+        try {
+            $file = $this
+                ->apiClient
+                ->getDocuments($bpnUser->getEmail(), $bpnUser->getPassword(), $id, $type);
+        } catch (ApiClientException|ResponseParserException $e) {
+            $file = null;
+        }
 
         if (null === $file || $file instanceof Notification) {
-            $this->addFlash('error', 'Keine Dokumente vorhanden');
+            $this->addFlash('error', 'Keine Dokumente vorhanden oder nicht abrufbar');
 
             return $this->redirectToRoute('app_bookings');
         }
@@ -84,4 +89,4 @@ class DownloadController extends AbstractController
 
         return $response;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Controller/Booking/EditController.php b/src/Controller/Booking/EditController.php
index 0d8d93a..7d0de41 100644
--- a/src/Controller/Booking/EditController.php
+++ b/src/Controller/Booking/EditController.php
@@ -3,6 +3,8 @@
 namespace App\Controller\Booking;
 
 use App\BusProNet\ApiClient;
+use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
 use App\BusProNet\Model\Notification;
 use App\BusProNet\XmlLoader\PickupLoader;
 use App\BusProNet\XmlLoader\TravelLoader;
@@ -69,10 +71,22 @@ class EditController extends AbstractController
         }
 
         // Fetch mutability information via API
-        $mutableData = $this->apiClient->getMutableData($bookingData->travelId);
+        try {
+            $mutableData = $this->apiClient->getMutableData($bookingData->travelId);
+        } catch (ApiClientException|ResponseParserException $e) {
+            $this->addFlash('error', 'Reisedaten nicht (mehr) verfügbar');
+
+            return $this->redirectToRoute('app_bookings');
+        }
 
         // Fetch availability information via API
-        $availabilities = $this->apiClient->getAvailabilities($bookingData->travelId);
+        try {
+            $availabilities = $this->apiClient->getAvailabilities($bookingData->travelId);
+        } catch (ApiClientException|ResponseParserException $e) {
+            $this->addFlash('error', 'Reisedaten nicht (mehr) verfügbar');
+
+            return $this->redirectToRoute('app_bookings');
+        }
 
         // Patch travel data with additional information from above
         $this->travelDataLoader->patchAvailabilities($travelData, $availabilities);
diff --git a/src/Controller/Booking/IndexController.php b/src/Controller/Booking/IndexController.php
index 0cca44a..260141b 100644
--- a/src/Controller/Booking/IndexController.php
+++ b/src/Controller/Booking/IndexController.php
@@ -3,6 +3,9 @@
 namespace App\Controller\Booking;
 
 use App\BusProNet\ApiClient;
+use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
+use App\BusProNet\Model\BaseData;
 use App\BusProNet\XmlLoader\TravelLoader;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Bundle\SecurityBundle\Security;
@@ -30,11 +33,16 @@ class IndexController extends AbstractController
             return $this->security->logout();
         }
 
-        $bookings = $this->apiClient->getBookings($bpnUser->getEmail(), $bpnUser->getPassword());
+        try {
+            $bookings = $this->apiClient->getBookings($bpnUser->getEmail(), $bpnUser->getPassword());
+        } catch (ApiClientException|ResponseParserException $e) {
+            $this->addFlash('error', 'Buchungen nicht abrufbar');
+            $bookings = new BaseData([]);
+        }
         $this->travelDataLoader->patchBookings($bookings);
 
         return $this->render('booking/index.html.twig', [
             'bookings' => $bookings->getItems(),
         ]);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Controller/PersonalDataController.php b/src/Controller/PersonalDataController.php
index dfbfdb4..87cae47 100644
--- a/src/Controller/PersonalDataController.php
+++ b/src/Controller/PersonalDataController.php
@@ -4,6 +4,8 @@ namespace App\Controller;
 
 use App\BusProNet\ApiClient;
 use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
+use App\BusProNet\Model\PersonalData;
 use App\Form\PersonalDataType;
 use Psr\Log\LoggerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -32,10 +34,14 @@ class PersonalDataController extends AbstractController
             return $this->security->logout();
         }
 
-        $personalData = $this
-            ->apiClient
-            ->getPersonalData($bpnUser->getEmail(), $bpnUser->getPassword())
-        ;
+        try {
+            $personalData = $this
+                ->apiClient
+                ->getPersonalData($bpnUser->getEmail(), $bpnUser->getPassword());
+        } catch (ApiClientException|ResponseParserException $e) {
+            $this->addFlash('error', 'Deine persönlichen Daten konnten nicht abgerufen werden');
+            $personalData = new PersonalData();
+        }
 
         $personalDataForm = $this->createForm(PersonalDataType::class, $personalData, [
             'attr' => ['novalidate' => 'novalidate'],
@@ -72,10 +78,14 @@ class PersonalDataController extends AbstractController
             return $this->security->logout();
         }
 
-        $personalData = $this
-            ->apiClient
-            ->getPersonalData($bpnUser->getEmail(), $bpnUser->getPassword())
-        ;
+        try {
+            $personalData = $this
+                ->apiClient
+                ->getPersonalData($bpnUser->getEmail(), $bpnUser->getPassword());
+        } catch (ApiClientException|ResponseParserException $e) {
+            $this->addFlash('error', 'Deine persönlichen Daten konnten nicht abgerufen werden');
+            $personalData = new PersonalData();
+        }
 
         $personalData->communication->newsletter = !$personalData->communication->newsletter;
 
@@ -85,10 +95,10 @@ class PersonalDataController extends AbstractController
             $this->logger->info('Updated newsletter registration', [
                 'email' => $bpnUser->getEmail(),
             ]);
-        } catch (ApiClientException $e) {
+        } catch (ApiClientException|ResponseParserException $e) {
             $this->addFlash('error', $e->getMessage());
         }
 
         return $this->redirectToRoute('app_personal_data');
     }
-}
\ No newline at end of file
+}
diff --git a/src/Controller/RegistrationController.php b/src/Controller/RegistrationController.php
index 9e2e6f0..4d21664 100644
--- a/src/Controller/RegistrationController.php
+++ b/src/Controller/RegistrationController.php
@@ -4,6 +4,7 @@ namespace App\Controller;
 
 use App\BusProNet\ApiClient;
 use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
 use App\Form\Model\RegistrationData;
 use App\Form\RegistrationType;
 use Psr\Log\LoggerInterface;
@@ -42,7 +43,7 @@ class RegistrationController extends AbstractController
                 $this->logger->info('Initiated registration', [
                     'email' => $registrationData->email,
                 ]);
-            } catch (ApiClientException $e) {
+            } catch (ApiClientException|ResponseParserException $e) {
                 $this->addFlash('error', $e->getMessage());
                 $this->logger->error('Error initiating registration', [
                     'email' => $registrationData->email,
diff --git a/src/Controller/ResetPasswordController.php b/src/Controller/ResetPasswordController.php
index 2bcb447..1ca5d72 100644
--- a/src/Controller/ResetPasswordController.php
+++ b/src/Controller/ResetPasswordController.php
@@ -4,6 +4,7 @@ namespace App\Controller;
 
 use App\BusProNet\ApiClient;
 use App\BusProNet\Exception\ApiClientException;
+use App\BusProNet\Exception\ResponseParserException;
 use Psr\Log\LoggerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Form\Extension\Core\Type\EmailType;
@@ -51,7 +52,7 @@ class ResetPasswordController extends AbstractController
                 $this->logger->info('Initiated password reset', [
                     'email' => $form->get('email')->getData(),
                 ]);
-            } catch (ApiClientException $e) {
+            } catch (ApiClientException|ResponseParserException $e) {
                 $this->addFlash('error', $e->getMessage());
                 $this->logger->error('Error initiating password reset', [
                     'email' => $form->get('email')->getData(),
@@ -66,4 +67,4 @@ class ResetPasswordController extends AbstractController
             'form' => $form->createView(),
         ]);
     }
-}
\ No newline at end of file
+}