Random post returned by get_permalink when on post type archive

[espellcaste]

get_permalink has an odd behavior when on post type archives.

It fetches a radom article from the taxonomy archive, instead of returning the link from the archive itself.

Maybe it was supposed to. But if I do this:

<a class="button" href="<?php echo wp_login_url( get_permalink() ); ?>">

When the link is on a category archive, it will redirect the user to a radom article from that particular category, because the get_permalink is returning that particular random post.

[lopo]

I checked and it doesn't return a random post, but the first one of the archive loop, as stated by ​the documentation:
"Note that when used outside The Loop on a posts page (index, archive, etc.) without the ID parameter, it will return the URL of the last post in The Loop, not the permalink for the current page."