diff --git a/trunk/src/AppBundle/Entity/TravelPeriodRepository.php b/trunk/src/AppBundle/Entity/TravelPeriodRepository.php
index f0857e28..8b5ea75f 100644
--- a/trunk/src/AppBundle/Entity/TravelPeriodRepository.php
+++ b/trunk/src/AppBundle/Entity/TravelPeriodRepository.php
@@ -442,7 +442,7 @@ class TravelPeriodRepository extends \Doctrine\ORM\EntityRepository
                     }
                 }
             }
-            elseif ($travelProgram->getIsPossibleStartDate($travelPeriod->getStartDate()))
+            elseif (count($travelPeriod->getDates()) && $travelProgram->getIsPossibleStartDate($travelPeriod->getStartDate()))
             {
                 $travelDateKey = $this->createTravelDateKey($travelPeriod->getStartDate(), $travelPeriod->getEndDate());
                 $flightPeriod = null;