diff --git a/src/BlueWest.MapTo/Extensions/CommonSource.cs b/src/BlueWest.MapTo/Extensions/CommonSource.cs
index 4553839..ee18ed0 100644
--- a/src/BlueWest.MapTo/Extensions/CommonSource.cs
+++ b/src/BlueWest.MapTo/Extensions/CommonSource.cs
@@ -6,6 +6,7 @@ using System.Text;
 using System.Collections.Immutable;
 using System.Diagnostics;
 using Microsoft.CodeAnalysis;
+#pragma warning disable CS8602
 
 namespace MapTo.Extensions
 {
@@ -207,7 +208,9 @@ namespace MapTo.Extensions
         private static void HandleEnumerable(SourceBuilder builder, MappedMember property)
         {
             var symbol = property.ActualSymbol as IPropertySymbol;
+#pragma warning disable CS8602
             builder.WriteCommentArray(symbol.Parameters, nameof(symbol.Parameters));
+#pragma warning restore CS8602
             builder.WriteCommentArray(symbol.TypeCustomModifiers, nameof(symbol.TypeCustomModifiers));
 
             builder.WriteComment($"Is enumerable {(property.ActualSymbol as IPropertySymbol).Parameters}");
diff --git a/src/BlueWest.MapTo/MappingContext.cs b/src/BlueWest.MapTo/MappingContext.cs
index 1f02b39..7d53c76 100644
--- a/src/BlueWest.MapTo/MappingContext.cs
+++ b/src/BlueWest.MapTo/MappingContext.cs
@@ -6,6 +6,7 @@ using MapTo.Extensions;
 using MapTo.Sources;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+#pragma warning disable CS8602
 
 namespace MapTo
 {
@@ -52,7 +53,7 @@ namespace MapTo
         
         protected INamedTypeSymbol UseUpdateAttributeTypeSymbol { get; }
 
-        public static INamedTypeSymbol JsonExtensionAttributeSymbol { get; set; }
+        public static INamedTypeSymbol JsonExtensionAttributeSymbol { get; set; } = null!;
 
         protected INamedTypeSymbol MappingContextTypeSymbol { get; }
 
@@ -269,7 +270,7 @@ namespace MapTo
 
             return new MappedMember(
                 property.Name,
-                property.GetTypeSymbol().ToString(),
+                property.GetTypeSymbol()?.ToString() ?? throw new InvalidOperationException(),
                 ToQualifiedDisplayName(propertyType) ?? propertyType.Name,
                 converterFullyQualifiedName,
                 converterParameters.ToImmutableArray(),
@@ -315,7 +316,9 @@ namespace MapTo
                 property,
                 namedType,
                 isEnumerable,
-               (property as IPropertySymbol).IsReadOnly);
+#pragma warning disable CS8602
+                (property as IPropertySymbol).IsReadOnly);
+#pragma warning restore CS8602
             ;
         }
 
diff --git a/src/BlueWest.MapTo/Sources/UpdateDataAttributeSource.cs b/src/BlueWest.MapTo/Sources/UpdateDataAttributeSource.cs
index 1bf082c..9b04d4c 100644
--- a/src/BlueWest.MapTo/Sources/UpdateDataAttributeSource.cs
+++ b/src/BlueWest.MapTo/Sources/UpdateDataAttributeSource.cs
@@ -2,6 +2,9 @@ using static MapTo.Sources.Constants;
 
 namespace MapTo.Sources
 {
+    /// <summary>
+    /// UpdateData Attribute Source
+    /// </summary>
     public class UpdateDataAttributeSource
     {
         internal const string AttributeName = "UpdateData";