With this plugin <?php referrer_link(); ?> is set when you enter a single post from a category, tag, author or archive page. But when the user came from home() of singular() nothing is set.
So when a user comes directly at a post or comes from "home" to the post the next and previous links does not get a proper category id.
Is there any solution to set a default category in the template? So when a user come at post page directly or from home() the default category is set. And previous and next links wil use the default category to navigate?