diff --git a/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentReader.cs b/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentReader.cs
index 049304131..246f8a27f 100644
--- a/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentReader.cs
+++ b/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentReader.cs
@@ -39,7 +39,7 @@ public void ReadValue(in BlobReadContext context, ref BinaryStreamReader reader,
                 string? typeFullName = reader.ReadSerString();
                 var type = typeFullName is not null
                     ? TypeNameParser.Parse(module, typeFullName)
-                    : context.ReaderContext.BadImageAndReturn<TypeSignature>("Type full name in attribute argument is null.");
+                    : null;
 
                 Elements.Add(type);
                 return;
diff --git a/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentWriter.cs b/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentWriter.cs
index c691a57cf..71049ab4b 100644
--- a/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentWriter.cs
+++ b/src/AsmResolver.DotNet/Signatures/CustomAttributeArgumentWriter.cs
@@ -52,6 +52,13 @@ private void WriteElement(TypeSignature argumentType, object? element)
         private void WriteNullElement(TypeSignature argumentType)
         {
             var writer = _context.Writer;
+
+            if (argumentType.IsTypeOf("System", "Type"))
+            {
+                writer.WriteSerString(default(string));
+                return;
+            }
+
             switch (argumentType.ElementType)
             {
                 case ElementType.String:
diff --git a/test/AsmResolver.DotNet.Tests/CustomAttributeTest.cs b/test/AsmResolver.DotNet.Tests/CustomAttributeTest.cs
index 903b65c44..3c7da128b 100644
--- a/test/AsmResolver.DotNet.Tests/CustomAttributeTest.cs
+++ b/test/AsmResolver.DotNet.Tests/CustomAttributeTest.cs
@@ -139,6 +139,16 @@ public void FixedEnumArgument(bool rebuild)
             Assert.Equal((int) TestEnum.Value3, argument.Element);
         }
 
+        [Theory]
+        [InlineData(false)]
+        [InlineData(true)]
+        public void FixedNullTypeArgument(bool rebuild)
+        {
+            var attribute =  GetCustomAttributeTestCase(nameof(CustomAttributesTestClass.FixedNullTypeArgument), rebuild);
+            var fixedArg = Assert.Single(attribute.Signature.FixedArguments);
+            Assert.Null(fixedArg.Element);
+        }
+
         [Theory]
         [InlineData(false)]
         [InlineData(true)]
diff --git a/test/TestBinaries/DotNet/AsmResolver.DotNet.TestCases.CustomAttributes/CustomAttributesTestClass.cs b/test/TestBinaries/DotNet/AsmResolver.DotNet.TestCases.CustomAttributes/CustomAttributesTestClass.cs
index e56c33afe..852f2d44f 100644
--- a/test/TestBinaries/DotNet/AsmResolver.DotNet.TestCases.CustomAttributes/CustomAttributesTestClass.cs
+++ b/test/TestBinaries/DotNet/AsmResolver.DotNet.TestCases.CustomAttributes/CustomAttributesTestClass.cs
@@ -1,133 +1,138 @@
-using System;
-using System.Collections.Generic;
-
-// Disable warnings for unused members. 
-#pragma warning disable 67
-
-namespace AsmResolver.DotNet.TestCases.CustomAttributes
-{
-    [TestCase]
-    public class CustomAttributesTestClass
-    {
-        [TestCase]
-        public event EventHandler TestEvent;
-        
-        [TestCase]
-        public int TestField;
-        
-        [TestCase]
-        public void TestMethod([TestCase] int testParameter)
-        {
-        }
-
-        [TestCase]
-        public int TestProperty
-        {
-            [TestCase]
-            get;
-            [TestCase]
-            set;
-        }
-
-        [TestCase(1)]
-        public void FixedInt32Argument()
-        {
-        }
-        
-        [TestCase("String fixed arg")]
-        public void FixedStringArgument()
-        {
-        }
-        
-        [TestCase(TestEnum.Value3)]
-        public void FixedEnumArgument()
-        {
-        }
-        
-        [TestCase(typeof(string))]
-        public void FixedTypeArgument()
-        {
-        }
-        
-        [TestCase(typeof(KeyValuePair<string[], int[]>))]
-        public void FixedComplexTypeArgument()
-        {
-        }
-        
-        [TestCase(2, "Fixed arg", TestEnum.Value3)]
-        public void FixedMultipleArguments()
-        {
-        }
-        
-        [TestCase(IntValue = 2)]
-        public void NamedInt32Argument()
-        {
-        }
-        
-        [TestCase(StringValue = "String named arg")]
-        public void NamedStringArgument()
-        {
-        }
-        
-        [TestCase(EnumValue = TestEnum.Value2)]
-        public void NamedEnumArgument()
-        {
-        }
-        
-        [TestCase(TypeValue = typeof(int))]
-        public void NamedTypeArgument()
-        {
-        }
-        
-        [TestCase(typeof(TestGenericType<object>))]
-        public void GenericType()
-        {
-        }
-        
-        [TestCase(typeof(TestGenericType<object>[]))]
-        public void GenericTypeArray()
-        {
-        }
-        
-        [TestCase((object) 123)]
-        public void Int32PassedAsObject()
-        {
-        }
-        
-        [TestCase((object) typeof(int))]
-        public void TypePassedAsObject()
-        {
-        }
-
-        [TestCase(new int[] {1, 2, 3, 4})]
-        public void FixedInt32ArrayArgument()
-        {
-        }
-
-        [TestCase(default(int[]))]
-        public void FixedInt32ArrayNullArgument()
-        {
-        }
-
-        [TestCase(new int[0])]
-        public void FixedInt32ArrayEmptyArgument()
-        {
-        }
-
-        [TestCase((object) new int[] {1, 2, 3, 4})]
-        public void FixedInt32ArrayAsObjectArgument()
-        {
-        }
-
-        [TestCase((object) default(int[]))]
-        public void FixedInt32ArrayAsObjectNullArgument()
-        {
-        }
-
-        [TestCase((object) new int[0])]
-        public void FixedInt32ArrayAsObjectEmptyArgument()
-        {
-        }
-
-    }
-}
\ No newline at end of file
+using System;
+using System.Collections.Generic;
+
+// Disable warnings for unused members.
+#pragma warning disable 67
+
+namespace AsmResolver.DotNet.TestCases.CustomAttributes
+{
+    [TestCase]
+    public class CustomAttributesTestClass
+    {
+        [TestCase]
+        public event EventHandler TestEvent;
+
+        [TestCase]
+        public int TestField;
+
+        [TestCase]
+        public void TestMethod([TestCase] int testParameter)
+        {
+        }
+
+        [TestCase]
+        public int TestProperty
+        {
+            [TestCase]
+            get;
+            [TestCase]
+            set;
+        }
+
+        [TestCase(1)]
+        public void FixedInt32Argument()
+        {
+        }
+
+        [TestCase("String fixed arg")]
+        public void FixedStringArgument()
+        {
+        }
+
+        [TestCase(TestEnum.Value3)]
+        public void FixedEnumArgument()
+        {
+        }
+
+        [TestCase(typeof(string))]
+        public void FixedTypeArgument()
+        {
+        }
+
+        [TestCase(typeof(KeyValuePair<string[], int[]>))]
+        public void FixedComplexTypeArgument()
+        {
+        }
+
+        [TestCase(2, "Fixed arg", TestEnum.Value3)]
+        public void FixedMultipleArguments()
+        {
+        }
+
+        [TestCase(IntValue = 2)]
+        public void NamedInt32Argument()
+        {
+        }
+
+        [TestCase(StringValue = "String named arg")]
+        public void NamedStringArgument()
+        {
+        }
+
+        [TestCase(EnumValue = TestEnum.Value2)]
+        public void NamedEnumArgument()
+        {
+        }
+
+        [TestCase(TypeValue = typeof(int))]
+        public void NamedTypeArgument()
+        {
+        }
+
+        [TestCase(typeof(TestGenericType<object>))]
+        public void GenericType()
+        {
+        }
+
+        [TestCase(typeof(TestGenericType<object>[]))]
+        public void GenericTypeArray()
+        {
+        }
+
+        [TestCase((object) 123)]
+        public void Int32PassedAsObject()
+        {
+        }
+
+        [TestCase((object) typeof(int))]
+        public void TypePassedAsObject()
+        {
+        }
+
+        [TestCase(new int[] {1, 2, 3, 4})]
+        public void FixedInt32ArrayArgument()
+        {
+        }
+
+        [TestCase(default(int[]))]
+        public void FixedInt32ArrayNullArgument()
+        {
+        }
+
+        [TestCase(new int[0])]
+        public void FixedInt32ArrayEmptyArgument()
+        {
+        }
+
+        [TestCase((object) new int[] {1, 2, 3, 4})]
+        public void FixedInt32ArrayAsObjectArgument()
+        {
+        }
+
+        [TestCase((object) default(int[]))]
+        public void FixedInt32ArrayAsObjectNullArgument()
+        {
+        }
+
+        [TestCase((object) new int[0])]
+        public void FixedInt32ArrayAsObjectEmptyArgument()
+        {
+        }
+
+        [TestCase((Type) null)]
+        public void FixedNullTypeArgument()
+        {
+        }
+
+    }
+}