Force mode is broken in CRM_Contact_BAO_Contact_Utils::updateGreeting()

I'm getting "unexpected error" fatal when I try to run the update_greeting Scheduled Job with the force=1 parameter included.

To recreate:

• go to Scheduled Jobs (admin/job?reset=1)
• edit the Greeting updater job to include required params:
  ct=Individual
  gt=email_greeting
  version=3
• click 'more' > Execute Now to run the job
  This gives result = Success in JobLog (and works properly)

• now edit the Job again and add another line to parameters:
  force=1
• Execute job again

result in JobLog = Failure, Error message: We experienced an unexpected error. Please post a detailed description and the backtrace on the CiviCRM forums: http://forum.civicrm.org/: