Fixed RPC NullRef

src/Discord.Net.Rpc/DiscordRpcApiClient.cs

@@ -59,7 +59,6 @@ namespace Discord.API
         private readonly AsyncEvent<Func<Exception, Task>> _disconnectedEvent = new AsyncEvent<Func<Exception, Task>>();
 
         private readonly ConcurrentDictionary<Guid, RpcRequest> _requests;
-        private readonly RequestQueue _requestQueue;
         private readonly IWebSocketClient _webSocketClient;
         private readonly SemaphoreSlim _connectionLock;
         private readonly string _clientId;
@@ -227,7 +226,7 @@ namespace Discord.API
             var requestTracker = new RpcRequest<TResponse>(options);
             _requests[guid] = requestTracker;
 
-            await _requestQueue.SendAsync(new WebSocketRequest(_webSocketClient, null, bytes, true, options)).ConfigureAwait(false);
+            await RequestQueue.SendAsync(new WebSocketRequest(_webSocketClient, null, bytes, true, options)).ConfigureAwait(false);
             await _sentRpcMessageEvent.InvokeAsync(cmd).ConfigureAwait(false);
             return await requestTracker.Promise.Task.ConfigureAwait(false);
         }