diff --git a/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
index 87b74f784..d1566d05b 100644
--- a/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
+++ b/src/Bundle/ChillPersonBundle/Validator/Constraints/Household/HouseholdMembershipSequentialValidator.php
@@ -35,7 +35,7 @@ class HouseholdMembershipSequentialValidator extends ConstraintValidator
             return;
         }
 
-        $covers = new DateRangeCovering(1, $participations[0]
+        $covers = new DateRangeCovering(1, $participations->first()
             ->getStartDate()->getTimezone());
 
         foreach ($participations as $k => $p) {