diff --git a/src/ninegate-1.0/src/Cadoles/PortalBundle/Repository/AlertRepository.php b/src/ninegate-1.0/src/Cadoles/PortalBundle/Repository/AlertRepository.php
index ea68490d..738b2aa5 100644
--- a/src/ninegate-1.0/src/Cadoles/PortalBundle/Repository/AlertRepository.php
+++ b/src/ninegate-1.0/src/Cadoles/PortalBundle/Repository/AlertRepository.php
@@ -46,7 +46,7 @@ class AlertRepository extends EntityRepository
         $niveau01=($user?$user->getNiveau01():null);
         $groups=($user?$user->getGroups():[]);
 
-        $userreads=($user?$user->getAlertreaders():[]);
+        $userreads=($user?$user->getAlertreaders():new ArrayCollection());
 
         // Initialisation du calcul des alerts
         $alerts=new ArrayCollection();