[Solved] Custom post type on author page blocked by wpdiscuz

Hi there,

I use the following code, to show a custom post type on the author page instead of the default post type:

function custom_post_author_archive($query) {
    if ($query->is_author) {
        $query->set( 'post_type', array('my_post_type') );
    }
    remove_action( 'pre_get_posts', 'custom_post_author_archive' );
}
add_action('pre_get_posts', 'custom_post_author_archive');

This worked great, until I installed wpdiscuz.

This is a screenshot with wpdiscuz:

And this is a screenshot with wpdiscuz soft-disabled (plugin folder moved into tmp folder):

How can I fix this issue? Why is it there in the first place?

Thanks!

Regards,
Florian