From e11c40eee461141e0348c234059b327075e19b2a Mon Sep 17 00:00:00 2001
From: astaxie <xiemengjun@gmail.com>
Date: Sat, 12 Oct 2013 16:56:30 +0800
Subject: [PATCH] fix #244

---
 filter.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/filter.go b/filter.go
index 16329709..2387e3a7 100644
--- a/filter.go
+++ b/filter.go
@@ -26,8 +26,10 @@ func (mr *FilterRouter) ValidRouter(router string) bool {
 			return true
 		}
 		matches := mr.regex.FindStringSubmatch(router)
-		if len(matches[0]) == len(router) {
-			return true
+		if len(matches) > 0 {
+			if len(matches[0]) == len(router) {
+				return true
+			}
 		}
 	}
 	return false