[Plugin: User Photo] Author photo only appears after the have written a post

I’ve been enjoying the User Photo plugin, it works great, although I can’t figure out one important thing.

The author photo will only appear on the author profile if the author has a post attributed to them. I’ve tested this on two different sites and have had the same results. I would like the author photo/default photo to show before the author has written a post.

I’m using this code to call the photo:
<?php userphoto($posts[0]->post_author); ?>

Has anybody else had this issue? Is it as simple as changing ‘post_author’ to something else? I’ve tried other variations to avail. Thanks!