diff --git a/index.php b/index.php
index e37420a..6aafb3a 100644
--- a/index.php
+++ b/index.php
@@ -32,6 +32,7 @@
 require_once(__DIR__ . '/../../config.php');
 
 // Permissions check.
+require_login();
 require_capability('local/sitestats:view', context_system::instance());
 
 // Initialize page.