diff --git a/CilTools.BytecodeAnalysis/Syntax/SyntaxNode.cs b/CilTools.BytecodeAnalysis/Syntax/SyntaxNode.cs
index 0e8b6d7..4c0861f 100644
--- a/CilTools.BytecodeAnalysis/Syntax/SyntaxNode.cs
+++ b/CilTools.BytecodeAnalysis/Syntax/SyntaxNode.cs
@@ -398,10 +398,23 @@ public static IEnumerable<SyntaxNode> GetTypeDefSyntax(Type t)
             content.Add(new GenericSyntax(Environment.NewLine));
 
             //base type
-            if ((t.IsClass || t.IsValueType) && t.BaseType!=null)
+            if (!t.IsInterface && t.BaseType!=null)
             {
                 content.Add(new KeywordSyntax(String.Empty, "extends", " ", KeywordKind.Other));
-                content.Add(new MemberRefSyntax(CilAnalysis.GetTypeFullNameSyntax(t.BaseType).ToArray(), t.BaseType));
+
+                try
+                {
+                    content.Add(new MemberRefSyntax(CilAnalysis.GetTypeFullNameSyntax(t.BaseType).ToArray(), t.BaseType));
+                }
+                catch (TypeLoadException ex) 
+                {
+                    //handle error when base type is not available
+                    content.Add(new IdentifierSyntax(String.Empty, "UnknownType", String.Empty, false, null));
+
+                    Diagnostics.OnError(
+                        t, new CilErrorEventArgs(ex, "Failed to read base type for: "+ t.Name)
+                        );
+                }
                 content.Add(new GenericSyntax(Environment.NewLine));
             }
 
diff --git a/CilView/UI.Controls/CilBrowser.xaml.cs b/CilView/UI.Controls/CilBrowser.xaml.cs
index 08a2d90..c636333 100644
--- a/CilView/UI.Controls/CilBrowser.xaml.cs
+++ b/CilView/UI.Controls/CilBrowser.xaml.cs
@@ -135,9 +135,20 @@ public ObservableCollection<MethodBase> NavigateToType(Type t)
         {
             if (t == null) return new ObservableCollection<MethodBase>();
 
-            CilBrowserPage page = new CilBrowserPage(t, Navigated);
-            page.Title = "Type: " + t.Name;
-            frameContent.Navigate(page);
+            string contenttext = String.Empty;
+
+            try
+            {
+                CilBrowserPage page = new CilBrowserPage(t, Navigated);
+                page.Title = "Type: " + t.Name;
+                frameContent.Navigate(page);
+                contenttext = page.ContentText;
+            }
+            catch (TypeLoadException ex) 
+            {
+                ErrorHandler.Current.Error(ex);
+                frameContent.Navigate(String.Empty);
+            }
 
             //display method list in left pane
             ObservableCollection<MethodBase> methods = AssemblySource.LoadMethods(t);
@@ -146,7 +157,7 @@ public ObservableCollection<MethodBase> NavigateToType(Type t)
             
             this.current_method = null;
             this.current_type = t;
-            this.text = page.ContentText;
+            this.text = contenttext;
 
             //make sure content is visible
             ExpandContentPane();