unreachable code after return statement

I noticed that I have this error in my firefox console, this comes from this piece of code:

Apparently this comes from inc/jquery.webForms.js

Anyone know anything about this mistake?
               

// Note: Do not delete parent only. It is present not everytime
            })
            .insertAfter($eInput.parent());
        });
       
        return this; }

    $.fn.multiplyable = function() {
        $(this).each(function() {
            var $input = $(this);
            var $inputParent = $input.parent();
            var $wrapper = $inputParent.clone().children().remove().end();

Could you provide the full error message ? 

How to reproduce it ?

You also have it on demo ...

I see no problem in this code, I think it's false positive message.

Ok, thanks Alex