Nivo Slider in Widget via PHP

So I’m working on a website and inserted the Simple Nivo Slider PHP code into a widget. It works, great! HOWEVER, I only want it to be on the homepage. I’ve tried to edit it (is_home), use Widget Logic, etc. but it continues to show up on every single page.

The code I’m using (and that Nivo supplied) is ‘<?php if (function_exists(‘simple_nivo_slider’)) simple_nivo_slider(); ?>’

Could anyone help me out?
Thanks!