diff --git a/src/ninegate-1.0/src/Cadoles/CoreBundle/Controller/GroupController.php b/src/ninegate-1.0/src/Cadoles/CoreBundle/Controller/GroupController.php
index 248eeddf..a1975ee4 100644
--- a/src/ninegate-1.0/src/Cadoles/CoreBundle/Controller/GroupController.php
+++ b/src/ninegate-1.0/src/Cadoles/CoreBundle/Controller/GroupController.php
@@ -599,9 +599,11 @@ class GroupController extends Controller
 
         // Notification message
         $usergroup = $em->getRepository("CadolesCoreBundle:Usergroup")->findOneBy(array("user"=>$this->getUser(),"group"=>$id));
-        $user=$em->getRepository("CadolesCoreBundle:User")->find($this->getUser());
-        $message="Désinscription de l'utilisateur<br>".$user->getLastname()." ".$user->getFirstname()."<br>Par ".$this->getUser()->getLastname()." ".$this->getUser()->getFirstname();;
-        $websocket = $this->container->get('cadoles.websocket.pushmessage')->send($usergroup->getKeyvalue(),$this->getUser()->getId(),$id,$message);
+        if($usergroup) {
+            $user=$em->getRepository("CadolesCoreBundle:User")->find($this->getUser());
+            $message="Désinscription de l'utilisateur<br>".$user->getLastname()." ".$user->getFirstname()."<br>Par ".$this->getUser()->getLastname()." ".$this->getUser()->getFirstname();;
+            $websocket = $this->container->get('cadoles.websocket.pushmessage')->send($usergroup->getKeyvalue(),$this->getUser()->getId(),$id,$message);
+        }
 
         // Desinscription
         $em->remove($usergroup);