From 7ee78181a31fc58bd3734f98b107685f8b46a47a Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonygarnockjones@gmail.com>
Date: Mon, 26 May 2014 05:51:42 -0400
Subject: [PATCH] Add missing case in matcherKeys

---
 route.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/route.js b/route.js
index c0f2f07..4756b1d 100644
--- a/route.js
+++ b/route.js
@@ -937,6 +937,7 @@ function Routing(exports) {
 	return walk(m, function (v, k) { return [v]; });
 
 	function walk(m, k) {
+	    if (m === null) return [];
 	    if (m instanceof $WildcardSequence) return null;
 	    if (m instanceof $Success) return [];
 	    if (m.has(__)) return null;