Error getting user_nicename

There an error getting user_nicename on a multi-site setup.

You should be using $wpdb->base_prefix instead of $wpdb->prefix in the following line in admin/publish.php:

$entries0 = $wpdb->get_results( 'SELECT user_nicename FROM '.$wpdb->prefix.'users WHERE ID='.$postpp->post_author);

https://ww.wp.xz.cn/plugins/facebook-auto-publish/