Fatal error: Uncaught Exception: Invalid session ID format in /var/www/b2b/aa/system/library/session.php on line 30

Exception: Invalid session ID format in /var/www/b2b/aa/system/library/session.php on line 30

Call Stack:
    0.0002     407144   1. {main}() /var/www/b2b/aa/index.php:0
    0.0082     813608   2. start() /var/www/b2b/aa/index.php:75
    0.0085     844576   3. require_once('/var/www/b2b/aa/system/framework.php') /var/www/b2b/aa/system/startup.php:120
    0.0145    1280712   4. Session->__construct() /var/www/b2b/aa/system/framework.php:126