From 118f5e5886c00a5d78815e89c6b0fa463d2af20b Mon Sep 17 00:00:00 2001
From: eaglerayp <eagle_rayp@hotmail.com>
Date: Wed, 14 Dec 2016 14:01:05 +0800
Subject: [PATCH] update: Fix panic bug

---
 unmarshal.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unmarshal.go b/unmarshal.go
index 15cd94a..15337fb 100644
--- a/unmarshal.go
+++ b/unmarshal.go
@@ -68,7 +68,7 @@ func (m M) isExtended() bool {
 	}
 
 	for k, _ := range m {
-		if k[0] != '$' {
+		if len(k) > 0 && k[0] != '$' {
 			return false
 		}
 	}