Throwing a Warning

With the latest version of this plugin and WordPress as of today, this plugin throws a PHP warning:

Warning: join(): Invalid arguments passed in /path/to/wordpress/root/wp-includes/post-template.php on line 394

Tracing the error down a bit, it appears this plugin is causing a problem with the get_body_class() function in post-template.php. Note that this is only appearing on pages, not posts.

https://www.ads-software.com/plugins/portfolio-post-type/