From 5315ff794a30295e5f018d23a8e5c4026782d97c Mon Sep 17 00:00:00 2001
From: Salman Ahmed <frenzibyte@gmail.com>
Date: Thu, 10 Mar 2022 21:29:32 +0300
Subject: [PATCH] Handle non-existing channels on message highlighting
 gracefully

---
 osu.Game/Overlays/ChatOverlay.cs | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/osu.Game/Overlays/ChatOverlay.cs b/osu.Game/Overlays/ChatOverlay.cs
index d6a1b23c46..a0b5e55014 100644
--- a/osu.Game/Overlays/ChatOverlay.cs
+++ b/osu.Game/Overlays/ChatOverlay.cs
@@ -309,10 +309,21 @@ namespace osu.Game.Overlays
         /// <param name="message">The message to highlight.</param>
         public void HighlightMessage(Message message)
         {
-            if (channelManager.CurrentChannel.Value.Id != message.ChannelId)
-                channelManager.CurrentChannel.Value = channelManager.JoinedChannels.Single(c => c.Id == message.ChannelId);
+            Channel targetChannel;
 
-            channelManager.CurrentChannel.Value.HighlightedMessage.Value = message;
+            if (channelManager.CurrentChannel.Value.Id == message.ChannelId)
+                targetChannel = channelManager.CurrentChannel.Value;
+            else
+            {
+                targetChannel = channelManager.JoinedChannels.SingleOrDefault(c => c.Id == message.ChannelId);
+
+                if (targetChannel != null)
+                    channelManager.CurrentChannel.Value = targetChannel;
+                else
+                    targetChannel = channelManager.JoinChannel(channelManager.AvailableChannels.SingleOrDefault(c => c.Id == message.ChannelId), true);
+            }
+
+            targetChannel.HighlightedMessage.Value = message;
         }
 
         private float startDragChatHeight;