diff --git a/src/SemanticScuttle/Service/Bookmark.php b/src/SemanticScuttle/Service/Bookmark.php
index 37a6a5e..87d9e02 100644
--- a/src/SemanticScuttle/Service/Bookmark.php
+++ b/src/SemanticScuttle/Service/Bookmark.php
@@ -285,10 +285,13 @@ class SemanticScuttle_Service_Bookmark extends SemanticScuttle_DbService
 
         $userservice = SemanticScuttle_Service_Factory::get('User');
         $user = $userservice->getCurrentObjectUser();
+        if ($user === null) {
+            return false;
+        }
 
         //user has to be either admin, or owner
         if ($GLOBALS['adminsCanModifyBookmarksFromOtherUsers']
-            && $userservice->isAdmin($user)
+            && $userservice->isAdmin($user->id)
         ) {
             return true;
         } else {
diff --git a/src/SemanticScuttle/Service/User.php b/src/SemanticScuttle/Service/User.php
index 7b03dd2..281c18c 100644
--- a/src/SemanticScuttle/Service/User.php
+++ b/src/SemanticScuttle/Service/User.php
@@ -407,6 +407,7 @@ class SemanticScuttle_Service_User extends SemanticScuttle_DbService
         }
         //reload user object
         $this->getCurrentUser(true);
+        $this->getCurrentObjectUser(true);
     }