PHP errors?

Hi – I am getting a critical error (on and off) on my website and after running some debugging, I get the error that it’s coming from the LDD plugin. Please see below for the information. After deactivating the plugin, the website functions fine. I have reactivated it now so that you can see the issue.

[20-Aug-2020 08:31:07 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 205
[20-Aug-2020 08:31:07 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 196
[20-Aug-2020 08:30:49 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 205
[20-Aug-2020 08:30:49 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 196
[20-Aug-2020 08:30:35 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 205
[20-Aug-2020 08:30:35 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 196
[20-Aug-2020 08:30:34 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 205
[20-Aug-2020 08:30:34 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 196
[20-Aug-2020 08:29:48 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 205
[20-Aug-2020 08:29:48 UTC] PHP Notice: Undefined variable: prefix in /usr/www/users/bronwrbwsg/wp-content/plugins/ldd-directory-lite/includes/admin/metaboxes.php on line 196

The page I need help with: [log in to see the link]