From 0aca2ab9707f86be436800a437606301674e922a Mon Sep 17 00:00:00 2001
From: ebozduman <ersan.bozduman@gmail.com>
Date: Fri, 4 Aug 2017 10:44:46 -0700
Subject: [PATCH] Stop attempting to close nil Listener (#4753)

---
 pkg/http/server.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/http/server.go b/pkg/http/server.go
index 5181e1f96..ef48bf097 100644
--- a/pkg/http/server.go
+++ b/pkg/http/server.go
@@ -118,6 +118,10 @@ func (srv *Server) Start() (err error) {
 
 // Shutdown - shuts down HTTP server.
 func (srv *Server) Shutdown() error {
+	if srv.listener == nil {
+		return errors.New("server not initialized")
+	}
+
 	if atomic.AddUint32(&srv.inShutdown, 1) > 1 {
 		// shutdown in progress
 		return errors.New("http server already in shutdown")