From 8abc9b436016899fb7ef660d64924e8a26aa7c81 Mon Sep 17 00:00:00 2001
From: CottageDwellingCat
 <80918250+CottageDwellingCat@users.noreply.github.com>
Date: Sun, 7 Nov 2021 20:11:19 -0600
Subject: [PATCH] Add state checking to ConnectionManager.StartAsync (#272)

---
 src/Discord.Net.WebSocket/ConnectionManager.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Discord.Net.WebSocket/ConnectionManager.cs b/src/Discord.Net.WebSocket/ConnectionManager.cs
index e444f359f..f304d4ea8 100644
--- a/src/Discord.Net.WebSocket/ConnectionManager.cs
+++ b/src/Discord.Net.WebSocket/ConnectionManager.cs
@@ -57,6 +57,9 @@ namespace Discord
 
         public virtual async Task StartAsync()
         {
+            if (State != ConnectionState.Disconnected)
+                throw new InvalidOperationException("Cannot start an already running client.");
+
             await AcquireConnectionLock().ConfigureAwait(false);
             var reconnectCancelToken = new CancellationTokenSource();
             _reconnectCancelToken?.Dispose();