Invalid argument

Hello,

This plugin used to work fine but now (after WP upgrades?) I’m getting this error at a site:

Warning: Invalid argument supplied for foreach() in /…/wp-content/plugins/multi-site-site-list-shortcode/multi-site-site-list-shortcode.php on line 157

and an empty page at another site.

Is this plugin still maintained?

Thanks.

https://ww.wp.xz.cn/plugins/multi-site-site-list-shortcode/