You mean if target is null? That's not a valid value to be passed to the plugin.
It does support an empty jQuery object so it doesn't break when used on several pages, but passing null or undefined makes no sense.

Could you describe the situation? thanks

Thanks for quick response.
Just pass a jquery object with selector that gives empty jquery set, ex:

$.scrollTo($("doesnotexist"));

You were right, it was handled when passing a selector but not a jQuery object, it now is. Can you download 2.1.2 and confirm it's fixed?
Thanks

Yep, it's fixed in 2.1.2.
Great job!