Modules may exist without an Assembly,in this case the line

"method.DeclaringType.Module.Assembly.EntryPoint"
causes a NullReferenceException as Assembly == null.
This change first checks if Module.Assembly != null.

ICSharpCode.Decompiler/Disassembler/MethodBodyDisassembler.cs

@@ -54,8 +54,8 @@ namespace ICSharpCode.Decompiler.Disassembler
 			output.WriteLine("// Method begins at RVA 0x{0:x4}", method.RVA);
 			output.WriteLine("// Code size {0} (0x{0:x})", body.CodeSize);
 			output.WriteLine(".maxstack {0}", body.MaxStackSize);
-			if (method.DeclaringType.Module.Assembly.EntryPoint == method)
-				output.WriteLine (".entrypoint");
+            if (method.DeclaringType.Module.Assembly != null && method.DeclaringType.Module.Assembly.EntryPoint == method)
+                output.WriteLine (".entrypoint");
 			
 			if (method.Body.HasVariables) {
 				output.Write(".locals ");