diff --git a/Controller/PermissionsGroupController.php b/Controller/PermissionsGroupController.php
index cf8230e09..a3d69cbbd 100644
--- a/Controller/PermissionsGroupController.php
+++ b/Controller/PermissionsGroupController.php
@@ -174,9 +174,9 @@ class PermissionsGroupController extends Controller
         $roleProvider = $this->roleProvider;
         $roleScopesSorted = array();
         foreach($roleScopes as $roleScope) {
+            
             /* @var $roleScope RoleScope */
             $title = $roleProvider->getRoleTitle($roleScope->getRole());
-            var_dump($title);
             $roleScopesSorted[$title][] = $roleScope;
         }
         ksort($roleScopesSorted);
diff --git a/Security/RoleProvider.php b/Security/RoleProvider.php
index ced7e584a..f72435cb1 100644
--- a/Security/RoleProvider.php
+++ b/Security/RoleProvider.php
@@ -40,9 +40,7 @@ class RoleProvider
      *
      * @var array|null
      */
-    private $rolesTitlesCache = [];
-    // sf4 check: mis [] au lieu de null
-    // pour éviter `Warning: array_key_exists() expects parameter 2 to be array, null given` L129
+    private $rolesTitlesCache = null;
     
     /**
      * Add a role provider