Index: Src/GoogleApis.Tests/Apis/Requests/BatchRequestTest.cs
===================================================================
--- a/Src/GoogleApis.Tests/Apis/Requests/BatchRequestTest.cs
+++ b/Src/GoogleApis.Tests/Apis/Requests/BatchRequestTest.cs
@@ -211,7 +211,7 @@
                 this.successful2ndResponse = successful2ndReponse;
             }
 
-            protected override async Task<HttpResponseMessage> SendAsyncCore(HttpRequestMessage request,
+            protected override Task<HttpResponseMessage> SendAsyncCore(HttpRequestMessage request,
                 CancellationToken cancellationToken)
             {
                 #region Verify Request Message
@@ -237,7 +237,9 @@
                     Encoding.UTF8, "multipart/mixed");
                 response.Content.Headers.ContentType.Parameters.Add(new NameValueHeaderValue("boundary", boundary));
 
-                return response;
+                TaskCompletionSource<HttpResponseMessage> tcs = new TaskCompletionSource<HttpResponseMessage>();
+                tcs.SetResult(response);
+                return tcs.Task;
             }
         }
 
@@ -323,6 +325,35 @@
         }
 
         [Test]
+        public void ExecuteAsync_NoCallback_Test()
+        {
+            var handler = new BatchMessageHandler(true);
+            var initializer = new BaseClientService.Initializer()
+            {
+                HttpClientFactory = new MockHttpClientFactory(handler)
+            };
+
+            using (var service = new MockClientService(initializer, "http://sample.com"))
+            {
+                var responses = new List<Tuple<MockResponse, RequestError, HttpResponseMessage>>();
+                var batch = new BatchRequest(service);
+                var request1 = new TestClientServiceRequest(service, new MockRequest
+                {
+                    ETag = "\"100\"",
+                    Name = "Name1"
+                });
+                var request2 = new TestClientServiceRequest(service, new MockRequest
+                {
+                    ETag = "\"200\"",
+                    Name = "Name1-1"
+                });
+                batch.Queue<MockResponse>(request1, null);
+                batch.Queue<MockResponse>(request2, null);
+                batch.ExecuteAsync().Wait();
+            }
+        }
+
+        [Test]
         public void CreateOuterRequestContent_Test()
         {
             using (var service = new MockClientService("http://sample.com"))
Index: Src/GoogleApis.Tests/GoogleApis.Tests.csproj
===================================================================
--- a/Src/GoogleApis.Tests/GoogleApis.Tests.csproj
+++ b/Src/GoogleApis.Tests/GoogleApis.Tests.csproj
@@ -51,7 +51,8 @@
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
     <DefineConstants>TRACE</DefineConstants>
-    <DocumentationFile>bin\Release\Google.Apis.Tests.xml</DocumentationFile>
+    <DocumentationFile>
+    </DocumentationFile>
     <DebugSymbols>true</DebugSymbols>
   </PropertyGroup>
   <ItemGroup>
Index: Src/GoogleApis/Apis/Requests/BatchRequest.cs
===================================================================
--- a/Src/GoogleApis/Apis/Requests/BatchRequest.cs
+++ b/Src/GoogleApis/Apis/Requests/BatchRequest.cs
@@ -101,6 +101,9 @@
                 HttpResponseMessage message)
             {
                 base.OnResponse(content, error, index, message);
+                if (OnResponseCallback == null)
+                    return;
+
                 OnResponseCallback(content as TResponse, error, index, message);
             }
         }
@@ -158,7 +161,7 @@
         }
 
         /// <summary>Asynchronously executes the batch request.</summary>
-        /// <param name="taskCancellationToken">Cancellation token to cancel operation.</param>
+        /// <param name="cancellationToken">Cancellation token to cancel operation.</param>
         public async Task ExecuteAsync(CancellationToken cancellationToken)
         {
             if (Count < 1)