[Zope] SystemError: NULL object passed to Py_BuildValue

[Olivier Laurent]

I have this weird error comming up at random intervals:
  SystemError: NULL object passed to Py_BuildValue

It occurs in a Plone site but I don't think it's related to Plone.

I have no access to some error log or to the Control Panel since it's
showing me the Plone login form whenever I want to access to restricted
information. Thanks to the event.log, here is the traceback:

- - - - - - - -

2004-06-03T17:33:19 ERROR(200) SiteError http://www.my_site.net/login_form
Traceback (most recent call last):
  File "/usr/local/lib/zope2.7/lib/python/ZPublisher/Publish.py", line 104, in publish
    if transactions_manager: transactions_manager.commit()
  File "/usr/local/lib/zope2.7/lib/python/Zope/App/startup.py", line 221, in commit
    get_transaction().commit()
  File "/usr/local/lib/zope2.7/lib/python/ZODB/Transaction.py", line 233, in commit
    ncommitted += self._commit_objects(objects)
  File "/usr/local/lib/zope2.7/lib/python/ZODB/Transaction.py", line 348, in _commit_objects
    jar.commit(o, self)
  File "/usr/local/lib/zope2.7/lib/python/ZODB/Connection.py", line 413, in commit
    state=object.__getstate__()
SystemError: NULL object passed to Py_BuildValue

- - - - - - - -

Python version:  2.3.3 (#1, May 18 2004, 08:35:20) 
                       [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-5)]
Zope version: 2.7
Plone version: 2.0-rc6

Any clue on what's going on. Is it a Python bug ?

-- 
Olivier Laurent.
P3B    : Club Python(-Zope) Belge ---------- http://www.p3b.org
OS3B   : Club Open-Software(-Linux) Carolo   http://www.os3b.org
Aragne : Python-Zope Solutions & Formations  http://www.aragne.com