Undefined selected_value in mtm_schema_enabled on change trigger

Hi

in our admin pages a javasript error is fired : Uncaught ReferenceError: selected_value is not defined

I happen to believe in your javascript code in admin/settings/schema.php
some code is missing to define the selected_value

now it says
$(‘#mtm_schema_enabled’).on(‘change’, function(){
if( $(this).val() > 0 ){
selected_value.show();
}else{

}
}).trigger(‘change’);

is the declaration of selected_value missing?
var value = $(this).find(“:selected”).val();
var selected_value = …..

although I think this on change trigger is not needed at all..