diff --git a/src/Controller/Booking/EditController.php b/src/Controller/Booking/EditController.php
index 9e1ba6d..b70d9a5 100644
--- a/src/Controller/Booking/EditController.php
+++ b/src/Controller/Booking/EditController.php
@@ -75,6 +75,12 @@ class EditController extends AbstractController
             return $this->redirectToRoute('app_bookings');
         }
 
+        if ($mutableData instanceof Notification) {
+            $this->addFlash('error', 'Reisedaten nicht (mehr) verfügbar');
+
+            return $this->redirectToRoute('app_bookings');
+        }
+
         // Fetch availability information via API
         try {
             $availabilities = $this->apiClient->getAvailabilities($bookingData->travelId);
@@ -84,6 +90,12 @@ class EditController extends AbstractController
             return $this->redirectToRoute('app_bookings');
         }
 
+        if ($availabilities instanceof Notification) {
+            $this->addFlash('error', 'Verfügbarkeitsdaten nicht (mehr) verfügbar');
+
+            return $this->redirectToRoute('app_bookings');
+        }
+
         // Patch travel data with additional information from above
         $this->travelDataLoader->patchAvailabilities($travelData, $availabilities);
         $this->travelDataLoader->patchMutability($travelData, $mutableData);