allowed '0' uid

diff --git a/lib/private/Group/Database.php b/lib/private/Group/Database.php
index 203b6d9f9374d31ac0545eee4143b3615433f5b8..938c267c7f177c4665f135de6646a96c059893ab 100644 (file)
--- a/lib/private/Group/Database.php
+++ b/lib/private/Group/Database.php
@@ -202,8 +202,8 @@ class Database extends \OC\Group\Backend {
         * if the user exists at all.
         */
        public function getUserGroups( $uid ) {
-               //guests has empty $uid
-               if (empty($uid)) {
+               //guests has empty or null $uid
+               if ($uid===null || $uid==='') {
                        return [];
                }