diff --git a/AltoRouter.php b/AltoRouter.php
index 5bd63b3..31aa338 100644
--- a/AltoRouter.php
+++ b/AltoRouter.php
@@ -204,7 +204,7 @@ public function match($requestUrl = null, $requestMethod = null)
             $requestUrl = substr($requestUrl, 0, $strpos);
         }
 
-        $lastRequestUrlChar = $requestUrl[strlen($requestUrl)-1];
+        $lastRequestUrlChar = $requestUrl ? $requestUrl[strlen($requestUrl)-1] : '';
 
         // set Request Method if it isn't passed as a parameter
         if ($requestMethod === null) {