[Plugin: Private Messages For WordPress] Doesn't send emails on new message? [FIXED]

The plugin is working wonderfully, but mail was not being sent when sending new private messages.

I changed line 410 from:
$recipient_email = $wpdb->get_var( "SELECT user_email from $wpdb->users WHERE display_name = '$rec'" );

to
$recipient_email = $wpdb->get_var( "SELECT user_email from $wpdb->users WHERE user_login = '$rec' LIMIT 1" );

and now it’s working properly.

https://www.ads-software.com/extend/plugins/private-messages-for-wordpress/