From 11f4b7cd860abc2c99d90da6e9e2b0c767af0e6a Mon Sep 17 00:00:00 2001
From: xtaci <daniel820313@gmail.com>
Date: Fri, 2 Sep 2016 11:01:56 +0800
Subject: [PATCH] NumStream should return 0 when Closed

---
 session.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/session.go b/session.go
index b3561e6..6cff757 100644
--- a/session.go
+++ b/session.go
@@ -125,6 +125,9 @@ func (s *Session) IsClosed() bool {
 
 // NumStreams returns the number of currently open streams
 func (s *Session) NumStreams() int {
+	if s.IsClosed() {
+		return 0
+	}
 	s.streamLock.Lock()
 	defer s.streamLock.Unlock()
 	return len(s.streams)