diff --git a/header.php b/header.php
index b04d48b..a095ce5 100644
--- a/header.php
+++ b/header.php
@@ -25,7 +25,7 @@
 	<script defer src="<?php echo get_template_directory_uri(); ?>/js/script.js"></script>
 </head>
 
-<body <?php $page_slug = $post->post_name; body_class($page_slug); ?>>
+<body <?php if (isset($post)) { body_class($post->post_name); } else { body_class(); }?>>
 
 	<?php roots_wrap_before(); ?>
 	<div id="wrap" class="container" role="document">
