diff --git a/src/runner/instance.rs b/src/runner/instance.rs
index a54f826..7a3a5af 100644
--- a/src/runner/instance.rs
+++ b/src/runner/instance.rs
@@ -9,11 +9,11 @@ pub fn set_globals(lua:&mlua::Lua,globals:&mlua::Table<'_>)->Result<(),mlua::Err
 
 	//Instance.new
 	instance_table.raw_set("new",
-		lua.create_function(|lua,(class_name,parent):(mlua::String,Instance)|{
+		lua.create_function(|lua,(class_name,parent):(mlua::String,Option<Instance>)|{
 			let class_name_str=class_name.to_str()?;
+			let parent=parent.ok_or(mlua::Error::runtime("Nil Parent not yet supported"))?;
 			dom_mut(lua,|dom|{
-				//TODO: Nil instances, accept optional parent:Option<Instance>
-				//let parent_ref=parent.map_or(NIL_INSTANCES,|instance|instance.referent);
+				//TODO: Nil instances
 				Ok(Instance::new(dom.insert(parent.referent,InstanceBuilder::new(class_name_str))))
 			})
 		})?