diff --git a/src/JSSoft.Communication/Grpc/AdaptorClient.cs b/src/JSSoft.Communication/Grpc/AdaptorClient.cs
index 31acaea..9de71e1 100644
--- a/src/JSSoft.Communication/Grpc/AdaptorClient.cs
+++ b/src/JSSoft.Communication/Grpc/AdaptorClient.cs
@@ -403,11 +403,6 @@ private void InvokeCallback(IService service, string name, string[] data)
         }
 
         var methodDescriptors = _methodsByService[service];
-        if (methodDescriptors.Contains(name) != true)
-        {
-            throw new InvalidOperationException("Invalid method name.");
-        }
-
         if (methodDescriptors.Contains(name) == true)
         {
             var methodDescriptor = methodDescriptors[name];
diff --git a/test/JSSoft.Communication.Tests/CallbackNoneTest.cs b/test/JSSoft.Communication.Tests/CallbackNoneTest.cs
new file mode 100644
index 0000000..b51c18b
--- /dev/null
+++ b/test/JSSoft.Communication.Tests/CallbackNoneTest.cs
@@ -0,0 +1,83 @@
+// <copyright file="CallbackNoneTest.cs" company="JSSoft">
+//   Copyright (c) 2024 Jeesu Choi. All Rights Reserved.
+//   Licensed under the MIT License. See LICENSE.md in the project root for license information.
+// </copyright>
+
+using JSSoft.Communication.Tests.Extensions;
+using Xunit.Abstractions;
+
+namespace JSSoft.Communication.Tests;
+
+public class CallbackNoneTest : IAsyncLifetime
+{
+    private const int Timeout = 30000;
+    private readonly ITestOutputHelper _logger;
+    private readonly TestServer1 _testServer = new();
+    private readonly ServerContext _serverContext;
+    private readonly ClientContext _clientContext;
+    private readonly RandomEndPoint _endPoint = new();
+    private ITestService1? _server;
+
+    private Guid _clientToken;
+    private Guid _serverToken;
+
+    public CallbackNoneTest(ITestOutputHelper logger)
+    {
+        _logger = logger;
+        _serverContext = new(_testServer) { EndPoint = _endPoint };
+        _clientContext = new(new ClientService<ITestService1>()) { EndPoint = _endPoint };
+        logger.WriteLine($"{_endPoint}");
+    }
+
+    public interface ITestService1
+    {
+        void Invoke();
+    }
+
+    public interface ITestService2
+    {
+        void Invoke();
+    }
+
+    public interface ITestCallback2
+    {
+        void OnInvoked();
+    }
+
+    [Fact]
+    public void Callback1_Test()
+    {
+        var manualResetEvent = new ManualResetEvent(false);
+        _clientContext.Disconnected += ClientContext_Disconnected;
+        _server!.Invoke();
+        Assert.True(manualResetEvent.WaitOne(Timeout));
+
+        void ClientContext_Disconnected(object? sender, EventArgs e)
+        {
+            manualResetEvent.Set();
+        }
+    }
+
+    public async Task InitializeAsync()
+    {
+        _logger.WriteLine($"InitializeAsync 1");
+        _serverToken = await _serverContext.OpenAsync(CancellationToken.None);
+        _clientToken = await _clientContext.OpenAsync(CancellationToken.None);
+        _server = _testServer;
+        _logger.WriteLine($"InitializeAsync 2");
+    }
+
+    public async Task DisposeAsync()
+    {
+        _logger.WriteLine($"DisposeAsync 1");
+        await _serverContext.ReleaseAsync(_serverToken);
+        await _clientContext.ReleaseAsync(_clientToken);
+        _endPoint.Dispose();
+        _logger.WriteLine($"DisposeAsync 2");
+    }
+
+    private sealed class TestServer1 : ServerService<ITestService1, ITestCallback2>, ITestService1
+    {
+        public void Invoke() => Client.OnInvoked();
+    }
+}