[Mailman Site List] Cron <mailman menubar> /var/mailman/cron/senddigests

[root menubar gnome org (Cron Daemon)]

Traceback (most recent call last):
  File "/var/mailman/cron/senddigests", line 94, in ?
    main()
  File "/var/mailman/cron/senddigests", line 86, in main
    mlist.send_digest_now()
  File "/var/mailman/Mailman/Digester.py", line 60, in send_digest_now
    ToDigest.send_digests(self, mboxfp)
  File "/var/mailman/Mailman/Handlers/ToDigest.py", line 132, in send_digests
    send_i18n_digests(mlist, mboxfp)
  File "/var/mailman/Mailman/Handlers/ToDigest.py", line 306, in send_i18n_digests
    msg = scrubber(mlist, msg)
  File "/var/mailman/Mailman/Handlers/Scrubber.py", line 262, in process
    size = len(payload)
TypeError: len() of unsized object