Undefined variable: popup

Notice: Undefined variable: popup in /path/to/wordpress/wp-content/plugins/feed-them-social/feeds/twitter/twitter-feed.php on line 217

If found this code in the line:

if ($popup == 'yes')

My workaround:

if (isset($popup) && $popup == 'yes')

Please change it in your version.

https://ww.wp.xz.cn/plugins/feed-them-social/