diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee2e9bd8..ba7476dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 Represents the **NuGet** versions.
 
+## v3.18.1
+- *Fixed*: The `ITypedMappedHttpClient.MapResponse` was not validating the input HTTP response correctly before mapping; resulted in a `null` success value versus the originating error/exception.
+- *Fixed*: The `HttpResult<T>.ThrowOnError` was not correctly throwing the internal exception. 
+
 ## v3.18.0
 - *Fixed*: Removed `Azure.Identity` dependency as no longer required; related to `https://github.com/advisories/GHSA-wvxc-855f-jvrv`.
 - *Fixed*: Removed `AspNetCore.HealthChecks.SqlServer` dependency as no longer required.
diff --git a/Common.targets b/Common.targets
index fa5005de..cb55d105 100644
--- a/Common.targets
+++ b/Common.targets
@@ -1,6 +1,6 @@
 <Project>
 	<PropertyGroup>
-		<Version>3.18.0</Version>
+		<Version>3.18.1</Version>
 		<LangVersion>preview</LangVersion>
 		<Authors>Avanade</Authors>
 		<Company>Avanade</Company>
diff --git a/src/CoreEx/Http/Extended/ITypedMappedHttpClient.cs b/src/CoreEx/Http/Extended/ITypedMappedHttpClient.cs
index ecd96f1e..e182be5e 100644
--- a/src/CoreEx/Http/Extended/ITypedMappedHttpClient.cs
+++ b/src/CoreEx/Http/Extended/ITypedMappedHttpClient.cs
@@ -23,7 +23,10 @@ public interface ITypedMappedHttpClient
         /// <typeparam name="TResponseHttp">The response HTTP <see cref="Type"/>.</typeparam>
         /// <param name="httpResult">The <see cref="HttpResult{T}"/>.</param>
         /// <returns>The mapped <see cref="HttpResult{T}"/>.</returns>
-        public HttpResult<TResponse> MapResponse<TResponse, TResponseHttp>(HttpResult<TResponseHttp> httpResult) => new(httpResult.Response, httpResult.BinaryContent, httpResult.IsSuccess && httpResult.Value is not null ? Mapper.Map<TResponse>(httpResult.Value, OperationTypes.Get) : default!);
+        public HttpResult<TResponse> MapResponse<TResponse, TResponseHttp>(HttpResult<TResponseHttp> httpResult)
+            => httpResult.ThrowIfNull().IsSuccess
+                ? new(httpResult.Response, httpResult.BinaryContent, Mapper.Map<TResponse>(httpResult.Value, OperationTypes.Get)!)
+                : new(httpResult.Response, httpResult.BinaryContent, httpResult.Exception);
 
         /// <summary>
         /// Maps the <typeparamref name="TRequest"/> <paramref name="value"/> to the <typeparamref name="TRequestHttp"/> <see cref="Type"/>.
diff --git a/src/CoreEx/Http/HttpResult.cs b/src/CoreEx/Http/HttpResult.cs
index 897507a1..e5eaf602 100644
--- a/src/CoreEx/Http/HttpResult.cs
+++ b/src/CoreEx/Http/HttpResult.cs
@@ -63,7 +63,7 @@ public static async Task<HttpResult<T>> CreateAsync<T>(HttpResponseMessage respo
                 }
                 catch (Exception ex)
                 {
-                    return new HttpResult<T>(response, content, new InvalidOperationException($"Unable to convert the content '{content}' [{MediaTypeNames.Text.Plain}] to Type {typeof(T).Name}.", ex));
+                    return new HttpResult<T>(response, content, new InvalidOperationException($"Unable to convert the content [{MediaTypeNames.Text.Plain}] content to Type {typeof(T).Name}.", ex));
                 }
             }
 
@@ -84,7 +84,7 @@ public static async Task<HttpResult<T>> CreateAsync<T>(HttpResponseMessage respo
             }
             catch (Exception ex)
             {
-                return new HttpResult<T>(response, content, new InvalidOperationException($"Unable to deserialize the JSON content '{content}' [{response.Content.Headers?.ContentType?.MediaType ?? "not specified"}] to Type {typeof(T).FullName}.", ex));
+                return new HttpResult<T>(response, content, new InvalidOperationException($"Unable to deserialize the JSON [{response.Content.Headers?.ContentType?.MediaType ?? "not specified"}] content to Type {typeof(T).FullName}.", ex));
             }
         }
 
diff --git a/src/CoreEx/Http/HttpResultT.cs b/src/CoreEx/Http/HttpResultT.cs
index af91a6ed..96058fd5 100644
--- a/src/CoreEx/Http/HttpResultT.cs
+++ b/src/CoreEx/Http/HttpResultT.cs
@@ -30,7 +30,7 @@ public class HttpResult<T> : HttpResultBase, IToResult<T>
         /// <param name="response">The <see cref="HttpResponseMessage"/>.</param>
         /// <param name="content">The <see cref="HttpResponseMessage.Content"/> as <see cref="BinaryData"/> (see <see cref="HttpContent.ReadAsByteArrayAsync()"/>).</param>
         /// <param name="internalException">The internal <see cref="Exception"/>.</param>
-        internal HttpResult(HttpResponseMessage response, BinaryData? content, Exception internalException) : this(response, content, default(T)!) => _internalException = internalException;
+        internal HttpResult(HttpResponseMessage response, BinaryData? content, Exception? internalException) : this(response, content, default(T)!) => _internalException = internalException;
 
         /// <summary>
         /// Gets the response value.
@@ -45,6 +45,11 @@ public T Value
             }
         }
 
+        /// <summary>
+        /// Gets the internal exception where the request/response handling was not successful; i.e. JSON deserialization error.
+        /// </summary>
+        public Exception? Exception => _internalException;
+
         /// <inheritdoc/>
         public override bool IsSuccess => _internalException is null && base.IsSuccess;
 
@@ -62,6 +67,9 @@ public HttpResult<T> ThrowOnError(bool throwKnownException = true, bool useConte
             if (IsSuccess)
                 return this;
 
+            if (_internalException is not null)
+                throw _internalException;
+
             if (throwKnownException)
             {
                 var eex = CreateExtendedException(Response, Content, useContentAsErrorMessage);
diff --git a/src/CoreEx/Results/Result.cs b/src/CoreEx/Results/Result.cs
index f9e22251..c8727110 100644
--- a/src/CoreEx/Results/Result.cs
+++ b/src/CoreEx/Results/Result.cs
@@ -41,7 +41,14 @@ public Result() { }
         public Result(Exception error) => _error = error.ThrowIfNull(nameof(error));
 
         /// <inheritdoc/>
-        object? IResult.Value => null;
+        object? IResult.Value
+        {
+            get
+            {
+                ThrowOnError();
+                return null;
+            }
+        }
 
         /// <inheritdoc/>
         public Exception Error { get => _error ?? throw new InvalidOperationException($"The {nameof(Error)} cannot be accessed as the {nameof(Result)} is in a successful state."); }
diff --git a/tests/CoreEx.Test/Framework/Http/HttpResultTest.cs b/tests/CoreEx.Test/Framework/Http/HttpResultTest.cs
new file mode 100644
index 00000000..1f0776eb
--- /dev/null
+++ b/tests/CoreEx.Test/Framework/Http/HttpResultTest.cs
@@ -0,0 +1,30 @@
+using CoreEx.Http;
+using NUnit.Framework;
+using System;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace CoreEx.Test.Framework.Http
+{
+    [TestFixture]
+    public class HttpResultTest
+    {
+        [Test]
+        public async Task Create_InternalException()
+        {
+            var r = new System.Net.Http.HttpResponseMessage(HttpStatusCode.OK) { Content = new System.Net.Http.StringContent("[]") };
+            var hr = await HttpResult.CreateAsync<int>(r);
+
+            Assert.That(hr.IsSuccess, Is.False);
+            Assert.Throws<InvalidOperationException>(() => hr.ThrowOnError());
+            Assert.Throws<InvalidOperationException>(() => _ = hr.Value);
+
+            var rr = hr.ToResult();
+            Assert.Multiple(() =>
+            {
+                Assert.That(rr.IsSuccess, Is.False);
+                Assert.That(rr.Error, Is.TypeOf<InvalidOperationException>());
+            });
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/CoreEx.Test/Framework/Http/TypedMapperHttpClientBaseTest.cs b/tests/CoreEx.Test/Framework/Http/TypedMapperHttpClientBaseTest.cs
new file mode 100644
index 00000000..8e3d3fb3
--- /dev/null
+++ b/tests/CoreEx.Test/Framework/Http/TypedMapperHttpClientBaseTest.cs
@@ -0,0 +1,135 @@
+using CoreEx.Http.Extended;
+using CoreEx.Mapping;
+using Moq;
+using NUnit.Framework;
+using System;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using System.Web.Http;
+using UnitTestEx.Mocking;
+
+namespace CoreEx.Test.Framework.Http
+{
+    [TestFixture]
+    public class TypedMapperHttpClientBaseTest
+    {
+        [Test]
+        public async Task MapSuccess()
+        {
+            var m = new Mapper();
+            m.Register(new CustomerMapper());
+            m.Register(new BackendMapper());
+
+            var mcf = UnitTestEx.NUnit.MockHttpClientFactory.Create();
+            mcf.CreateDefaultClient().Request(HttpMethod.Post, "test").WithJsonBody(new Backend { First = "John", Last = "Doe" }).Respond.WithJson(new Backend { First = "John", Last = "Doe" });
+
+            var mc = new TypedMappedHttpClient(mcf.GetHttpClient()!, m);
+            var hr = await mc.PostMappedAsync<Customer, Backend, Customer, Backend>("test", new Customer { FirstName = "John", LastName = "Doe" });
+
+            Assert.Multiple(() =>
+            {
+                Assert.That(hr.IsSuccess, Is.True);
+                Assert.That(hr.Value, Is.Not.Null);
+            });
+            Assert.Multiple(() =>
+            {
+                Assert.That(hr.Value.FirstName, Is.EqualTo("John"));
+                Assert.That(hr.Value.LastName, Is.EqualTo("Doe"));
+            });
+
+            var r = hr.ToResult();
+            Assert.That(r.IsSuccess, Is.True);
+        }
+
+        [Test]
+        public async Task MapServerError()
+        {
+            var m = new Mapper();
+            m.Register(new CustomerMapper());
+            m.Register(new BackendMapper());
+
+            var mcf = UnitTestEx.NUnit.MockHttpClientFactory.Create();
+            mcf.CreateDefaultClient().Request(HttpMethod.Post, "test").WithJsonBody(new Backend { First = "John", Last = "Doe" }).Respond.With(HttpStatusCode.InternalServerError);
+
+            var mc = new TypedMappedHttpClient(mcf.GetHttpClient()!, m);
+            var hr = await mc.PostMappedAsync<Customer, Backend, Customer, Backend>("test", new Customer { FirstName = "John", LastName = "Doe" });
+
+            Assert.Multiple(() =>
+            {
+                Assert.That(hr.IsSuccess, Is.False);
+                Assert.That(hr.StatusCode, Is.EqualTo(HttpStatusCode.InternalServerError));
+            });
+
+            var r = hr.ToResult();
+            Assert.Multiple(() =>
+            {
+                Assert.That(r.IsSuccess, Is.False);
+                Assert.That(r.Error, Is.TypeOf<HttpRequestException>());
+            });
+        }
+
+        [Test]
+        public async Task MapJsonError()
+        {
+            var m = new Mapper();
+            m.Register(new CustomerMapper());
+            m.Register(new BackendMapper());
+
+            var mcf = UnitTestEx.NUnit.MockHttpClientFactory.Create();
+            mcf.CreateDefaultClient().Request(HttpMethod.Post, "test").WithJsonBody(new Backend { First = "John", Last = "Doe" }).Respond.WithJson("{\"first\":\"Dave\",\"age\":\"ten\"}");
+
+            var mc = new TypedMappedHttpClient(mcf.GetHttpClient()!, m);
+            var hr = await mc.PostMappedAsync<Customer, Backend, Customer, Backend>("test", new Customer { FirstName = "John", LastName = "Doe" });
+
+            Assert.Multiple(() =>
+            {
+                Assert.That(hr.IsSuccess, Is.False);
+                Assert.That(hr.StatusCode, Is.EqualTo(HttpStatusCode.InternalServerError));
+                Assert.That(hr.Exception, Is.TypeOf<InvalidOperationException>());
+            });
+
+            var r = hr.ToResult();
+            Assert.Multiple(() =>
+            {
+                Assert.That(r.IsSuccess, Is.False);
+                Assert.That(r.Error, Is.TypeOf<InvalidOperationException>());
+            });
+        }
+    }
+
+    public class Customer
+    { 
+        public string? FirstName { get; set; }
+        public string? LastName { get; set; }
+    }
+
+    public class Backend
+    {
+        public string? First { get; set; }
+        public string? Last { get; set; }
+        public int? Age { get; set; }
+    }
+
+    public class CustomerMapper : CoreEx.Mapping.Mapper<Customer, Backend>
+    {
+        protected override Backend? OnMap(Customer? source, Backend? destination, OperationTypes operationType)
+        {
+            destination ??= new Backend();
+            destination.First = source?.FirstName;
+            destination.Last = source?.LastName;
+            return destination;
+        }
+    }
+
+    public class BackendMapper : Mapper<Backend, Customer>
+    {
+        protected override Customer? OnMap(Backend? source, Customer? destination, OperationTypes operationType)
+        {
+            destination ??= new Customer();
+            destination.FirstName = source?.First;
+            destination.LastName = source?.Last;
+            return destination;
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/CoreEx.Test/Framework/Results/ResultTTest.cs b/tests/CoreEx.Test/Framework/Results/ResultTTest.cs
index 2f51d219..6e43d48d 100644
--- a/tests/CoreEx.Test/Framework/Results/ResultTTest.cs
+++ b/tests/CoreEx.Test/Framework/Results/ResultTTest.cs
@@ -219,5 +219,12 @@ public async Task AsTask()
                 Assert.That(r.Value, Is.EqualTo(1));
             });
         }
+
+        [Test]
+        public void Failure_Value()
+        {
+            var ir = (IResult)Result<int>.Fail("On no!");
+            Assert.Throws<BusinessException>(() => _ = ir.Value);
+        }
     }
 }
\ No newline at end of file
diff --git a/tests/CoreEx.Test/Framework/Results/ResultTest.cs b/tests/CoreEx.Test/Framework/Results/ResultTest.cs
index 2bc90530..190ab57d 100644
--- a/tests/CoreEx.Test/Framework/Results/ResultTest.cs
+++ b/tests/CoreEx.Test/Framework/Results/ResultTest.cs
@@ -141,5 +141,19 @@ public async Task AsTask()
             var r = await Result.Go().AsTask();
             Assert.That(r, Is.EqualTo(Result.Success));
         }
+
+        [Test]
+        public void Success_Value()
+        {
+            var ir = (IResult)Result.Success;
+            Assert.That(ir.Value, Is.Null);
+        }
+
+        [Test]
+        public void Failure_Value()
+        {
+            var ir = (IResult)Result.Fail("On no!");
+            Assert.Throws<BusinessException>(() => _ = ir.Value);
+        }
     }
 }
\ No newline at end of file