From 76e961629e8963dec7a333d54f8d1d0ba513fbe2 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Sat, 25 Jun 2016 15:17:44 +0900
Subject: [PATCH] [Modify] Polish it

---
 websocket-sharp/Net/EndPointManager.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/websocket-sharp/Net/EndPointManager.cs b/websocket-sharp/Net/EndPointManager.cs
index 6923e9fa..4db251ec 100644
--- a/websocket-sharp/Net/EndPointManager.cs
+++ b/websocket-sharp/Net/EndPointManager.cs
@@ -190,7 +190,11 @@ namespace WebSocketSharp.Net
     {
       lock (((ICollection) _addressToEndpoints).SyncRoot) {
         var addr = listener.Address;
-        var endpoints = _addressToEndpoints[addr];
+
+        Dictionary<int, EndPointListener> endpoints;
+        if (!_addressToEndpoints.TryGetValue (addr, out endpoints))
+          return;
+
         endpoints.Remove (listener.Port);
         if (endpoints.Count == 0)
           _addressToEndpoints.Remove (addr);