Load entities after failed transaction

Hi,

I tried to save User into database (postgresql) in manual transaction like this (there is only one save and is not necessary to use manual transaction, but it's only an example):

public function indexAction() {

        $db = $this->di->get('db');

        try {
            $db->begin();

            $gender = \Gender::findFirst(1);

            // Create user object and set gender relation
            $user = new User();
            $user->setName('Rocky');
            $user->gender = $gender;

            // store user, but error occurs
            $user->save();

            $db->commit();
        } catch (\Exception $e) {
            $db->rollback();
        }

        /*
         * The problem is here.
         * Now, when the data are fetched via \Phalcon\MVC\Model, exception 'SQLSTATE[25P02]: In failed sql 
         * transaction: 7 ERROR: current transaction is aborted, commands ignored until end of transaction block' occurs
         * 
         * If you can use raw sql below, it's correct
         */
        $users = \User::find();
        $db->commit();

//      $sql = 'select * from users;';
//      $result = $db->query($sql);
//      $result->setFetchMode(\Phalcon\Db::FETCH_ASSOC);
//      $result = $result->fetchAll($result);
    }

When the save on the User failed, rollback is correct, but next find method fails, and PDO exception occurs:

SQLSTATE[25P02]: In failed sql transaction: 7 ERROR: current transaction is aborted, commands ignored until end of transaction block

DB connection is set shared in DI container.

When I try use raw sql (commented code in example) instead of model method find, data are fetched correctly.

In the db adapter is the transation level after rollback 1, after commit 0 (if all is ok).

I tried it with Phalcon version 1.3.4 and 2.0.7 and postgresql 9.3.

It's a bug? Thanks a lot.