diff --git a/src/BusProNet/DataProcessor/BookingDataProcessor.php b/src/BusProNet/DataProcessor/BookingDataProcessor.php
index f5fcce7..e782437 100644
--- a/src/BusProNet/DataProcessor/BookingDataProcessor.php
+++ b/src/BusProNet/DataProcessor/BookingDataProcessor.php
@@ -33,16 +33,20 @@ class BookingDataProcessor
             foreach ($servicesToMap as $service) {
                 if (false === isset($this->additionalServices[$service->id])) {
                     $serviceToAdd = $travelData->additionalServices[$service->id];
-                    $bookingData->additionalServices[$service->id] = $serviceToAdd;
-                    $bookingData->additionalServices[$service->id]->individualPrice[$participant->index] = $serviceToAdd->price;
+                    if (null !== $serviceToAdd) {
+                        $bookingData->additionalServices[$service->id] = $serviceToAdd;
+                        $bookingData->additionalServices[$service->id]->individualPrice[$participant->index] = $serviceToAdd->price;
+                    }
                 }
                 $bookingData->additionalServices[$service->id]->mapping[] = $participant->index;
             }
             foreach ([$participant->transportationServiceTo, $participant->transportationServiceFro] as $service) {
                 if (false === isset($this->transportationServices[$service->id])) {
                     $serviceToAdd = $travelData->transportationServices[$service->id];
-                    $bookingData->transportationServices[$service->id] = $serviceToAdd;
-                    $bookingData->transportationServices[$service->id]->individualPrice[$participant->index] = $serviceToAdd->price;
+                    if (null !== $serviceToAdd) {
+                        $bookingData->transportationServices[$service->id] = $serviceToAdd;
+                        $bookingData->transportationServices[$service->id]->individualPrice[$participant->index] = $serviceToAdd->price;
+                    }
                 }
                 $bookingData->transportationServices[$service->id]->mapping[] = $participant->index;
             }