Redis session driver broken

Code:

A PHP Error was encountered
Severity: Notice
Message: Undefined index: timeout
Filename: drivers/Session_redis_driver.php
Line Number: 148

Code:

$config['sess_driver'] = 'redis';
$config['sess_save_path'] = 'tcp://localhost:6379';

I'm assuming timeout should be set in this block?

Code:

        elseif (preg_match('#(?:tcp://)?([^:?]+)(?:\:(\d+))?(?<options>\?.+)?#', $this->_config['save_path'], $matches))
        {
            $save_path = array(
                'host' => $matches[1],
                'port' => empty($matches[2]) ? NULL : $matches[2]
            );
        }