diff --git a/Issue4681/Issue4681.csproj b/Issue4681/Issue4681.csproj
new file mode 100644
index 0000000..c5d7e12
--- /dev/null
+++ b/Issue4681/Issue4681.csproj
@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net8.0;net48</TargetFrameworks>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <SignAssembly>True</SignAssembly>
+	<PublicSign>true</PublicSign>
+    <AssemblyOriginatorKeyFile>nunit.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="InvertedTomato.Crc" Version="1.3.6" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
+  </ItemGroup>
+
+</Project>
diff --git a/Issue4681/Issue4681.sln b/Issue4681/Issue4681.sln
new file mode 100644
index 0000000..732c0ac
--- /dev/null
+++ b/Issue4681/Issue4681.sln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Issue4681", "Issue4681.csproj", "{491A5BD4-1DCE-48C1-92AA-D39307FCD7A0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{491A5BD4-1DCE-48C1-92AA-D39307FCD7A0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{491A5BD4-1DCE-48C1-92AA-D39307FCD7A0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{491A5BD4-1DCE-48C1-92AA-D39307FCD7A0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{491A5BD4-1DCE-48C1-92AA-D39307FCD7A0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal
diff --git a/Issue4681/UnitTest1.cs b/Issue4681/UnitTest1.cs
new file mode 100644
index 0000000..e41e8f6
--- /dev/null
+++ b/Issue4681/UnitTest1.cs
@@ -0,0 +1,19 @@
+using InvertedTomato.Crc;
+using NUnit.Framework;
+using System.Text;
+using System;
+
+public class Tests
+{
+    [Test]
+    public void BugReport()
+    {
+        var crc = CrcAlgorithm.CreateCrc16CcittFalse();
+
+        // Give it some bytes to chew on - you can call this multiple times if needed
+        crc.Append(Encoding.ASCII.GetBytes("Hurray for cake!"));
+
+        // Get the output - as a hex string, byte array or unsigned integer
+        Console.WriteLine(crc.ToHexString());
+    }
+}
\ No newline at end of file
diff --git a/Issue4681/nunit.snk b/Issue4681/nunit.snk
new file mode 100644
index 0000000..db2cc7f
Binary files /dev/null and b/Issue4681/nunit.snk differ