diff --git a/docs/build/nest/core/multi-search.html b/docs/build/nest/core/multi-search.html
index 357317621f6..1fe23d51dff 100644
--- a/docs/build/nest/core/multi-search.html
+++ b/docs/build/nest/core/multi-search.html
@@ -3,7 +3,7 @@
 <p>The multi search API allows to execute several search requests within the same API.</p>
 <h3 id="fluent-syntax">Fluent Syntax</h3>
 <pre><code>var result = client.MultiSearch(ms =&gt; ms
-    .Search&lt;ElasticsearchProject&gt;(&quot;esproj&quot;, s =&gt; s.MatchAll())
+    .Search&lt;ElasticsearchProject&gt;(&quot;projects&quot;, s =&gt; s.MatchAll())
     .Search&lt;Person&gt;(&quot;people&quot;, s =&gt; s.MatchAll())
 );
 </code></pre><h3 id="object-initializer-syntax">Object Initializer Syntax</h3>
@@ -11,12 +11,12 @@ <h3 id="fluent-syntax">Fluent Syntax</h3>
 {
     Operations = new Dictionary&lt;string, ISearchRequest&gt;
     {
-        { &quot;esproj&quot;, new SearchRequest 
+        { &quot;projects&quot;, new SearchRequest&lt;ElasticsearchProject&gt;
             { 
                 Query = new QueryContainer(new MatchAllQuery()) 
             } 
         },
-        { &quot;people&quot;, new SearchRequest 
+        { &quot;people&quot;, new SearchRequest&lt;Person&gt;
             { 
                 Query = new QueryContainer(new MatchAllQuery()) 
             } 
@@ -28,7 +28,7 @@ <h3 id="fluent-syntax">Fluent Syntax</h3>
 </code></pre><h2 id="handling-the-multi-search-response">Handling the Multi Search Response</h2>
 <p><code>MultiSearch</code> returns an <code>IMultiSearchResponse</code> object.  Each <code>SearchResponse&lt;T&gt;</code> can be retrieved using the corresponding name that was specified in the request.</p>
 <pre><code>// returns a SearchResponse&lt;ElasticsearchProject&gt;&gt;
-var projects = result.GetResponse&lt;ElasticsearchProject&gt;(&quot;esproj&quot;);
+var projects = result.GetResponse&lt;ElasticsearchProject&gt;(&quot;projects&quot;);
 
 // returns a SearchResponse&lt;Person&gt;&gt;
 var people = result.GetResponse&lt;Person&gt;(&quot;people&quot;);
diff --git a/docs/contents/nest/core/multi-search.markdown b/docs/contents/nest/core/multi-search.markdown
index c0a6b38f329..0213fb7b5a6 100644
--- a/docs/contents/nest/core/multi-search.markdown
+++ b/docs/contents/nest/core/multi-search.markdown
@@ -13,7 +13,7 @@ The multi search API allows to execute several search requests within the same A
 ### Fluent Syntax
 
 	var result = client.MultiSearch(ms => ms
-		.Search<ElasticsearchProject>("esproj", s => s.MatchAll())
+		.Search<ElasticsearchProject>("projects", s => s.MatchAll())
 		.Search<Person>("people", s => s.MatchAll())
 	);
 
@@ -24,12 +24,12 @@ The multi search API allows to execute several search requests within the same A
 	{
 		Operations = new Dictionary<string, ISearchRequest>
 		{
-			{ "esproj", new SearchRequest 
+			{ "projects", new SearchRequest<ElasticsearchProject>
 				{ 
 					Query = new QueryContainer(new MatchAllQuery()) 
 				} 
 			},
-			{ "people", new SearchRequest 
+			{ "people", new SearchRequest<Person>
 				{ 
 					Query = new QueryContainer(new MatchAllQuery()) 
 				} 
@@ -44,7 +44,7 @@ The multi search API allows to execute several search requests within the same A
 `MultiSearch` returns an `IMultiSearchResponse` object.  Each `SearchResponse<T>` can be retrieved using the corresponding name that was specified in the request.
 
 	// returns a SearchResponse<ElasticsearchProject>>
-	var projects = result.GetResponse<ElasticsearchProject>("esproj");
+	var projects = result.GetResponse<ElasticsearchProject>("projects");
 
 	// returns a SearchResponse<Person>>
 	var people = result.GetResponse<Person>("people");
diff --git a/src/Nest/Resolvers/Converters/MultiSearchConverter.cs b/src/Nest/Resolvers/Converters/MultiSearchConverter.cs
index 47a7920ff17..d8e9c33542f 100644
--- a/src/Nest/Resolvers/Converters/MultiSearchConverter.cs
+++ b/src/Nest/Resolvers/Converters/MultiSearchConverter.cs
@@ -96,7 +96,7 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
 			{
 				var descriptor = m.Descriptor.Value;
 				var concreteTypeSelector = descriptor.TypeSelector;
-				var baseType = m.Descriptor.Value.ClrType;
+				var baseType = m.Descriptor.Value.ClrType ?? typeof(object);
 				
 				var generic = MakeDelegateMethodInfo.MakeGenericMethod(baseType);
 
diff --git a/src/Tests/Nest.Tests.Integration/Nest.Tests.Integration.csproj b/src/Tests/Nest.Tests.Integration/Nest.Tests.Integration.csproj
index ce6743c2e9f..b89d1606a64 100644
--- a/src/Tests/Nest.Tests.Integration/Nest.Tests.Integration.csproj
+++ b/src/Tests/Nest.Tests.Integration/Nest.Tests.Integration.csproj
@@ -178,6 +178,7 @@
     <Compile Include="Reproduce\Reproduce994Tests.cs" />
     <Compile Include="Reproduce\Reproduce986Tests.cs" />
     <Compile Include="Reproduce\Reproduce960Tests.cs" />
+    <Compile Include="Reproduce\Reproduce1279Tests.cs" />
     <Compile Include="Search\Filter\AndOrNotFilterTests.cs" />
     <Compile Include="Search\Filter\ScriptFilterTests.cs" />
     <Compile Include="Search\Filter\MissingExistsFilterTests.cs" />
diff --git a/src/Tests/Nest.Tests.Integration/Reproduce/Reproduce1279Tests.cs b/src/Tests/Nest.Tests.Integration/Reproduce/Reproduce1279Tests.cs
new file mode 100644
index 00000000000..1fac4bb30f4
--- /dev/null
+++ b/src/Tests/Nest.Tests.Integration/Reproduce/Reproduce1279Tests.cs
@@ -0,0 +1,40 @@
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using FluentAssertions;
+using Nest.Tests.MockData.Domain;
+using Newtonsoft.Json.Linq;
+
+namespace Nest.Tests.Integration.Reproduce
+{
+	[TestFixture]
+	public class Reproduce1279Tests : IntegrationTests
+	{
+		[Test]
+		public void MultiSearchNullArgumentException()
+		{
+			var request = new MultiSearchRequest
+			{
+				Operations = new Dictionary<string, ISearchRequest>
+				{
+					{ "test", new SearchRequest
+						{
+							Query = new QueryContainer(new MatchAllQuery()),
+							Types = new TypeNameMarker[] { typeof(Product), typeof(ElasticsearchProject) },
+							TypeSelector = (o, h) => typeof(ElasticsearchProject)
+						}
+					}
+				}
+			};
+
+			var result = Client.MultiSearch(request);
+			result.IsValid.Should().BeTrue();
+			var response = result.GetResponse<object>("test");
+			var projects = response.Documents.OfType<ElasticsearchProject>().ToList();
+			projects.Count.Should().BeGreaterThan(0);
+		}
+	}
+}