diff --git a/blocks/site_main_menu/block_site_main_menu.php b/blocks/site_main_menu/block_site_main_menu.php
index 5050d7d80cd..c2c07f43c20 100644
--- a/blocks/site_main_menu/block_site_main_menu.php
+++ b/blocks/site_main_menu/block_site_main_menu.php
@@ -33,7 +33,7 @@ class block_site_main_menu extends block_list {
         $ismoving  = ismoving($this->instance->pageid);
 
         $sections = get_all_sections($this->instance->pageid);
-        if(empty($sections)) {
+        if(empty($sections) or !isset($sections[0])) {
             return $this->content;
         }