plugins/wp-rss-poster/admin/admin.php on line 25

This error is happening on this website:
http://www.localterror.com/

error:
Warning: Creating default object from empty value in /public_html/wp-content/plugins/wp-rss-poster/admin/admin.php on line 25

I take it the Developer of this plugin has stopped supporting it?

https://ww.wp.xz.cn/plugins/wp-rss-poster/