From ad495cc60b29abbf0564c3ec362c1f1f471cb968 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Sat, 10 Oct 2020 17:47:01 +0900
Subject: [PATCH] [Modify] Polish it

---
 websocket-sharp/Net/HttpListenerPrefixCollection.cs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/websocket-sharp/Net/HttpListenerPrefixCollection.cs b/websocket-sharp/Net/HttpListenerPrefixCollection.cs
index 42bc55a0..765213de 100644
--- a/websocket-sharp/Net/HttpListenerPrefixCollection.cs
+++ b/websocket-sharp/Net/HttpListenerPrefixCollection.cs
@@ -146,12 +146,10 @@ namespace WebSocketSharp.Net
       if (_prefixes.Contains (uriPrefix))
         return;
 
+      if (_listener.IsListening)
+        EndPointManager.AddPrefix (uriPrefix, _listener);
+
       _prefixes.Add (uriPrefix);
-
-      if (!_listener.IsListening)
-        return;
-
-      EndPointManager.AddPrefix (uriPrefix, _listener);
     }
 
     /// <summary>