Subharanjan on "[Plugin: Jetpack by WordPress.com] Fatal error after upgrading to latest !!"

My error_log file contains lots of these lines....
[23-Aug-2013 18:42:02 UTC] PHP Fatal error: Call to a member function get_active_modules() on a non-object in /home/xyz/public_xyz/wp-content/plugins/jetpack/class.jetpack-heartbeat.php on line 76

http://wordpress.org/plugins/jetpack/