diff --git a/page.php b/page.php
index 0a9a605..15dc794 100644
--- a/page.php
+++ b/page.php
@@ -14,7 +14,7 @@ $thematiqueColorSlug = $mainThematique->slug;
 				<?php
 				$currentPage = get_post();
 				$parentPage = $currentPage->post_parent !== 0 ? get_post($currentPage->post_parent) : null;
-				$grandParentPage = $parentPage->post_parent ? get_post($parentPage->post_parent) : null;
+				$grandParentPage = $parentPage && $parentPage->post_parent ? get_post($parentPage->post_parent) : null;
 
 				?>
 				<ol>