diff --git a/src/User/Helper/AuthHelper.php b/src/User/Helper/AuthHelper.php
index 45a5504..3f7bf91 100644
--- a/src/User/Helper/AuthHelper.php
+++ b/src/User/Helper/AuthHelper.php
@@ -99,7 +99,8 @@ class AuthHelper
     public function getUnassignedItems(AbstractAuthItem $model)
     {
         $excludeItems = $model->item !== null ? [$model->item->name] : [];
-        $items = $this->getAuthManager()->getItems($model->getType(), $excludeItems);
+        $type = $model->getType() == Permission::TYPE_PERMISSION ?: null;
+        $items = $this->getAuthManager()->getItems($type, $excludeItems);
 
         return ArrayHelper::map(
             $items,