Hi,
in private function getPermealinkStructure() look at option 'option_type', this field never exist in MU. I changed this line (~83) and the Plugin works perfect:
// $sql = "select option_name, option_type, option_value from ".$wpdb->options." where option_name = 'permalink_structure'";
$sql = "select option_name, option_value from ".$wpdb->options." where option_name = 'permalink_structure'";
Thanks for all your work here :)