diff --git a/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php b/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
index 66db97fdb..5299bbb7a 100644
--- a/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
+++ b/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
@@ -271,7 +271,7 @@ class DbUserGroupBackend extends DbRepository implements Inspectable, UserGroupB
      */
     protected function persistGroupId($groupName)
     {
-        if (! $groupName || empty($groupName) || is_numeric($groupName)) {
+        if (empty($groupName) || is_numeric($groupName)) {
             return $groupName;
         }