MySQL Error - Commands out of sync; you can't run this command now

Question

I am using MySQL with PHP, Codeigniter. I had a question which was answered by bluefeet in the post here

I created a stored procedure for the second solution by blue

Answer 1

Try:

more_results() && $dbms->next_result())
    {
        $result = $dbms->store_result();

        if(is_object($result)){ $result->free(); }

        unset($result);
    }
?>

After procedure call. MySQLi can't call another procedure, while has previous results. You should use free() for each of them before any further procedure call or query execution.

Source: http://php.net/manual/en/mysqli.query.php