Phalcon cassandra pdo error and I dont want to hide notice. I want to fix it

Question

I am using cassandra pdo with phalcon it's working fine but its returnig rowcount notice when i am trying to insert data using create method.

*Notice: Undefined index: rowcount *

Can anyone suggest me how to fix it ??

$instance = new $model();
$instance->save($obj_data); //this lines returns notice.

As on now I am using YAcassandra pdo with phalcon. URL (https://github.com/Orange-OpenSource/YACassandraPDO/)

Does anyone know any other PDO which is easy to use with phalcon and supports all datatypes ??

Thanks