diff --git a/code/controllers/CMSMain.php b/code/controllers/CMSMain.php
index 9ed8c73d..5ab2ae6c 100644
--- a/code/controllers/CMSMain.php
+++ b/code/controllers/CMSMain.php
@@ -264,7 +264,9 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
 				$def[$class]['defaultChild'] = $defaultChild;
 			
 			$defaultParent = $obj->defaultParent();
-			$id = $defaultParent ? SiteTree::get_by_link($defaultParent)->ID : null;
+			$parent = SiteTree::get_by_link($defaultParent);
+			
+			$id = $parent ? $parent->id : null;
 			
 			if ($defaultParent != 1 && $defaultParent != null)  $def[$class]['defaultParent'] = $defaultParent;