resolve issue occuring when scanned assembly contains an interface

NuGet.Config

@@ -3,5 +3,6 @@
   <packageSources>
     <add key="BepInEx" value="https://nuget.bepinex.dev/v3/index.json" />
     <add key="Samboy Feed" value="https://nuget.samboy.dev/v3/index.json" />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
   </packageSources>
 </configuration>

VCF.Core/Registry/CommandRegistry.cs

@@ -276,8 +276,8 @@ public static void UnregisterConverter(Type converter)
 		}
 	}
 
-	internal static bool IsGenericConverterContext(Type rootType) => rootType.BaseType.Name == typeof(CommandArgumentConverter<>).Name;
-	internal static bool IsSpecificConverterContext(Type rootType) => rootType.BaseType.Name == typeof(CommandArgumentConverter<,>).Name;
+	internal static bool IsGenericConverterContext(Type rootType) => rootType?.BaseType?.Name == typeof(CommandArgumentConverter<>).Name;
+	internal static bool IsSpecificConverterContext(Type rootType) => rootType?.BaseType?.Name == typeof(CommandArgumentConverter<,>).Name;
 
 	public static void RegisterConverter(Type converter)
 	{

VCF.Tests/AssertReplyContext.cs

@@ -25,16 +25,23 @@ public void Reply(string v)
 
 	public void AssertReply(string expected)
 	{
-		Assert.That(_sb.ToString().TrimEnd(Environment.NewLine.ToCharArray()), Is.EqualTo(expected));
+		Assert.That(RepliedTextLfAndTrimmed(), Is.EqualTo(expected));
 	}
 	public void AssertReplyContains(string expected)
 	{
-		var repliedText = _sb.ToString().TrimEnd(Environment.NewLine.ToCharArray());
+		var repliedText = RepliedTextLfAndTrimmed();
 		Assert.That(repliedText.Contains(expected), Is.True, $"Expected {expected} to be contained in replied: {repliedText}");
 	}
 
 	public void AssertInternalError()
 	{
-		Assert.That(_sb.ToString().TrimEnd(Environment.NewLine.ToCharArray()), Is.EqualTo("[vcf] An internal error has occurred."));
+		Assert.That(RepliedTextLfAndTrimmed(), Is.EqualTo("[vcf] An internal error has occurred."));
+	}
+
+	private string RepliedTextLfAndTrimmed()
+	{
+		return _sb.ToString()
+			.Replace("\r\n", "\n") // LF instead of CRLF for line endings
+			.TrimEnd(Environment.NewLine.ToCharArray());
 	}
 }

VCF.Tests/InitializationTests.cs

@@ -0,0 +1,47 @@
+using System.Reflection;
+using FakeItEasy;
+using NUnit.Framework;
+using VampireCommandFramework;
+
+namespace VCF.Tests;
+
+public class InitializationTests
+{
+	[SetUp]
+	public void Setup()
+	{
+		CommandRegistry.Reset();
+	}
+
+	[TearDown]
+	public void TearDown()
+	{
+		CommandRegistry.Reset();
+	}
+
+	[Test]
+	public void ScanningInterfaceDoesNotCauseException()
+	{
+		Assert.DoesNotThrow(ScanAssemblyContainingInterface);
+	}
+
+	private void ScanAssemblyContainingInterface()
+	{
+		CommandRegistry.RegisterAll(AssemblyContainingInterface());
+	}
+
+	private Assembly AssemblyContainingInterface()
+	{
+		var mockAssembly = A.Fake<Assembly>();
+		A.CallTo(() => mockAssembly.GetTypes()).Returns(new Type[]{
+			typeof(ISomeInterface),
+		});
+		return mockAssembly;
+	}
+
+	private interface ISomeInterface
+	{
+
+	}
+
+}