diff --git a/code/Model/SiteTree.php b/code/Model/SiteTree.php
index a63f4e3a..aa4d033b 100755
--- a/code/Model/SiteTree.php
+++ b/code/Model/SiteTree.php
@@ -759,8 +759,8 @@ class SiteTree extends DataObject implements PermissionProvider, i18nEntityProvi
     public function InSection($sectionName)
     {
         $page = Director::get_current_page();
-        while ($page && $page->exists()) {
-            if ($sectionName == $page->URLSegment) {
+        while ($page instanceof SiteTree && $page->exists()) {
+            if ($sectionName === $page->URLSegment) {
                 return true;
             }
             $page = $page->Parent();