diff --git a/Klein.php b/Klein.php
index ebe1601..12167d1 100644
--- a/Klein.php
+++ b/Klein.php
@@ -49,9 +49,9 @@ class Klein {
         $result = $arr;
         foreach ($items as $key) {
             if (is_array($result)) {
-                $result = $result[$key];
+                $result = isset($result[$key]) ? $result[$key] : null;
             } else {
-                $result = $result->{$key};
+                $result = isset($result->{$key}) ? $result->{$key} : null;
             }
         }
         return $result;