From 54022561f5ff75de15591968b56be910f4d323b6 Mon Sep 17 00:00:00 2001
From: Dmitry Shulyak <yashulyak@gmail.com>
Date: Wed, 9 Jan 2019 09:40:07 +0200
Subject: [PATCH] If rendezvous wasn't start or was already stopped ignore Stop
 call (#1340)

---
 discovery/rendezvous.go      | 3 +++
 discovery/rendezvous_test.go | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/discovery/rendezvous.go b/discovery/rendezvous.go
index 3e4f74ea6..3868ce7ce 100644
--- a/discovery/rendezvous.go
+++ b/discovery/rendezvous.go
@@ -92,6 +92,9 @@ func (r *Rendezvous) Start() error {
 func (r *Rendezvous) Stop() error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
+	if r.client == nil {
+		return nil
+	}
 	r.cancelRootCtx()
 	if err := r.client.Close(); err != nil {
 		return err
diff --git a/discovery/rendezvous_test.go b/discovery/rendezvous_test.go
index 922c524d1..a3522c155 100644
--- a/discovery/rendezvous_test.go
+++ b/discovery/rendezvous_test.go
@@ -83,6 +83,12 @@ func TestRendezvousRegisterAndDiscoverExitGracefully(t *testing.T) {
 	require.EqualError(t, errDiscoveryIsStopped, err.Error())
 }
 
+func TestStopStoppedNode(t *testing.T) {
+	r, err := NewRendezvous(make([]ma.Multiaddr, 1), nil, nil)
+	require.NoError(t, err)
+	require.NoError(t, r.Stop())
+}
+
 func BenchmarkRendezvousStart(b *testing.B) {
 	identity, err := crypto.GenerateKey()
 	require.NoError(b, err)