diff --git a/inc/category.class.php b/inc/category.class.php
index d84ce1c7d..ce4f4f5c0 100644
--- a/inc/category.class.php
+++ b/inc/category.class.php
@@ -120,7 +120,7 @@ public static function getCategoryTree($rootId = 0, $helpdeskHome = false) {
             ]
          ]
          + ($helpdeskHome ? ['helpdesk_home' => '1']: [])
-         + $dbUtils->getEntitiesRestrictCriteria($form_table, "", "", true, false),
+         + [$dbUtils->getEntitiesRestrictCriteria($form_table, "", "", true, false)],
       ]);
       $count2 = new QuerySubQuery([
          'COUNT' => 'count',