diff --git a/src/Illuminate/Routing/Route.php b/src/Illuminate/Routing/Route.php
index 7664500784f8..02518733300c 100755
--- a/src/Illuminate/Routing/Route.php
+++ b/src/Illuminate/Routing/Route.php
@@ -583,7 +583,7 @@ public function parentOfParameter($parameter)
     {
         $key = array_search($parameter, array_keys($this->parameters));
 
-        if ($key === 0) {
+        if ($key === 0 || $key === false) {
             return;
         }