Parameter expected to be a reference error

I just installed this as it should do exactly what I want but when the plugin is active, I get the following message appearing across the top of my site (and in my side bar):

Warning: Parameter 2 to wp_hide_post_Public::query_posts_join() expected to be a reference, value given in /var/www/html/wp-includes/class-wp-hook.php on line 286

Any ideas on how to fix this or make the error go away. The plugin seems to be working but having that message on my public site is a non-starter.

Using the most recent version of the plug-in and WP version 4.9.6

• This topic was modified 7 years, 10 months ago by dagorym.