Hello,
We cannot reproduce it, but you can use the following solution, just change this code in main file of plugin:
function mcgfuidgen_load_value($post_id){
global $wpdb;
// load value from db
if ( defined( “MCGFUIDGEN_DEBUG” ) ) mcgfuidgen_log(“>mcgfuidgen_load_value post_id = $post_id”);
$sql = $wpdb->prepare(“SELECT id_int, id_str FROM ".MCGFUIDGEN_TABLE_NAME."
WHERE post_id = %d”, array($post_id));
$qr = $wpdb->get_results($sql);