NoneType' object has no attribute 'commit'

Kevin Shuk and I spent some time on the phone looking for the cause of this defect and could not discern a cause. We decided we would add some more logging to the code where the following error message originated from. It is our goal to catch the transient error y adding more effective logging to the area where the error occurred.

From: Cron Daemon <email address hidden>
To: <email address hidden>
Subject: Cron <sfi-prod@niobium> /srv/salesforce/production/production/sfi-salesforce/bin/selfservcontacts 7
Date: Thu, 30 Oct 2008 11:00:09 +0000 (GMT) (04:00 PDT)

Traceback (most recent call last):
  File "/srv/salesforce/production/production/sfi-salesforce/bin/../canonical/salesforce/sfi_crons/selfservcontacts.py", line 119, in ?
    main()
  File "/srv/salesforce/production/production/sfi-salesforce/bin/../canonical/salesforce/sfi_crons/selfservcontacts.py", line 112, in main
    process_selfserv_users(args.get('days'))
  File "/srv/salesforce/production/production/sfi-salesforce/bin/../canonical/salesforce/sfi_crons/selfservcontacts.py", line 64, in process_selfserv_users
    changed_contact_batch.update()
  File "/srv/salesforce/production/production/sfi-pyax/pyax/sobject/batch.py", line 193, in update
    self[save_result['id']].commit()
AttributeError: 'NoneType' object has no attribute 'commit'