How to not load comments form on post preview?

I need a way not to load the comments form when previewing a post, is there a way to achieve this? How?

If you need a reason to help: I use disqus and it generates a url for the “discussion” the first time the comment form loads, if this is the preview then it will look something like site.com/?post_type=food&p=41009 And this is a problem because afterwards when the post is published under a real url disqus will not recognize the comments count. The only way is to manually change the discussion url. I’ve already contacted disqus and they say, “not a bug” if you do not want disqus to pick the preview url, don’t load disqus on the preview page, the only way i know is to completely remove the comments form, so how would i go about this? Is there some sort of conditional for the preview page?