diff --git a/index.php b/index.php
index 7c5fe6d14..da11fd9fb 100644
--- a/index.php
+++ b/index.php
@@ -2,6 +2,6 @@
 
 require __DIR__.'/app/common.php';
 
-if (! $container['router']->dispatch($_SERVER['REQUEST_URI'], $_SERVER['QUERY_STRING'])) {
+if (! $container['router']->dispatch($_SERVER['REQUEST_URI'], isset($_SERVER['QUERY_STRING']) ? $_SERVER['QUERY_STRING'] : '')) {
     die('Page not found!');
 }