Certificate check crashes

I issued the command below and got a crash. The error said to report it here, so I am. Bazaar 1.3.1 on Ubuntu Hardy. It looks like a cert check failure, but bzr shouldn't crash in that case. The bzr repository concerned is readable by the public (though not writeable).

Gerv

gerv@otter:src$ bzr co https://dm-bugstage01.mozilla.org/bmo/3.2 bmo
bzr: ERROR: pycurl.error: (60, 'server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt')

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 834, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 790, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 991, in run
    branch_location)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 773, in open_tree_or_branch
    bzrdir = klass.open(location)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 651, in open
    return BzrDir.open_from_transport(t, _unsupported=_unsupported)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 688, in open_from_transport
    redirected)
  File "/usr/lib/python2.5/site-packages/bzrlib/lazy_import.py", line 125, in __call__
    return obj(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/__init__.py", line 1664, in do_catching_redirections
    return action(transport)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 665, in find_format
    transport, _server_formats=_server_formats)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 1422, in find_format
    return format.probe_transport(transport)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 1432, in probe_transport
    format_string = transport.get(".bzr/branch-format").read()
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/http/__init__.py", line 125, in get
    code, response_file = self._get(relpath, None)
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/http/_pycurl.py", line 166, in _get
    return self._get_full(relpath)
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/http/_pycurl.py", line 201, in _get_full
    self._curl_perform(curl, header)
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/http/_pycurl.py", line 325, in _curl_perform
    curl.perform()
error: (60, 'server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt')

bzr 1.3.1 on python 2.5.2.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'co', 'https://dm-bugstage01.mozilla.org/bmo/3.2', 'bmo']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_GB.UTF-8'
plugins:
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.