[Spambayes] sb_imapfilter.py crashes after a few hours.

[Rick Gregory]

I'm running a9 and periodically sb_imapfilter crashes. I run it by issuing:

python sb_imapfilter.py -c -t -l 5 &

Everything's fine, but then after some period less than 24 hours it 
exits with this traceback:

Traceback (most recent call last):
  File "sb_imapfilter.py", line 857, in ?
    run()
  File "sb_imapfilter.py", line 847, in run
    imap_filter.Filter()
  File "sb_imapfilter.py", line 719, in Filter
    self.unsure_folder)
  File "sb_imapfilter.py", line 633, in Filter
    for msg in self:
  File "sb_imapfilter.py", line 528, in __iter__
    yield self[key]
  File "sb_imapfilter.py", line 560, in __getitem__
    data = _extract_fetch_data(response[1][0])
  File "sb_imapfilter.py", line 162, in _extract_fetch_data
    mo = FETCH_RESPONSE_RE.match(response)
TypeError: expected string or buffer

Vitals: Python 2.3.2, Mandrake Linux 9.1, filtering a remote IMAP server running Courier with SSL on.