When I have no published posts, the plugin produces the following PHP error in all widget areas:
Notice: Trying to get property of non-object in /wp-includes/post-template.php on line 29
Upon publishing a post, the notices go away. When I deactivate the plugin, no errors. I deactivated all other plugins, narrowed it down to this one. Same thing happens across multiple themes (tested with twenty fourteen and my custom theme).
Having no posts is not a common scenario, of course, but the bug should be fixed nonetheless.