From 6df3f9fefc2586c1d98499ef863e13def8f33e71 Mon Sep 17 00:00:00 2001
From: Alexandre Oliveira <rockytvbr@gmail.com>
Date: Sat, 19 Aug 2017 02:32:36 -0300
Subject: [PATCH] Check if user is not in channel before joining it

Moved the join logic to the null check statement because it wouldn't make sense to add a null channel to a user.
---
 ChatSharp/Handlers/ChannelHandlers.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ChatSharp/Handlers/ChannelHandlers.cs b/ChatSharp/Handlers/ChannelHandlers.cs
index 3c9e56c..d85fc2b 100644
--- a/ChatSharp/Handlers/ChannelHandlers.cs
+++ b/ChatSharp/Handlers/ChannelHandlers.cs
@@ -12,9 +12,14 @@ namespace ChatSharp.Handlers
         {
             var channel = client.Channels.GetOrAdd(message.Parameters[0]);
             var user = client.Users.GetOrAdd(message.Prefix);
-            user.Channels.Add(channel);
+
             if (channel != null)
+            {
+                if (!user.Channels.Contains(channel))
+                    user.Channels.Add(channel);
+
                 client.OnUserJoinedChannel(new ChannelUserEventArgs(channel, new IrcUser(message.Prefix)));
+            }
         }
 
         public static void HandleGetTopic(IrcClient client, IrcMessage message)