Mod_python error: "PythonHandler mod_python.publisher"

Traceback (most recent call last):

  File "/usr/lib64/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/lib64/python2.4/site-packages/mod_python/publisher.py", line 213, in handler
    published = publish_object(req, object)

  File "/usr/lib64/python2.4/site-packages/mod_python/publisher.py", line 412, in publish_object
    return publish_object(req,util.apply_fs_data(object, req.form, req=req))

  File "/usr/lib64/python2.4/site-packages/mod_python/util.py", line 439, in apply_fs_data
    return object(**args)

  File "/var/www/vhosts/visitflanders/htdocs/do/ecco.py", line 298, in cview
    return all_items(req, listid, live, template, summary, tags=tags, period=period)

  File "/var/www/vhosts/visitflanders/htdocs/do/ecco.py", line 237, in all_items
    return action.finish()

  File "/var/www/vhosts/visitflanders/htdocs/do/eccocms/EccoViewAction.py", line 245, in finish
    return EccoAction.finish(self)

  File "/var/www/vhosts/visitflanders/htdocs/do/eccocms/EccoAction.py", line 267, in finish
    return Action.finish(self)

  File "/var/www/vhosts/visitflanders/htdocs/do/bright/Webapp2.py", line 368, in finish
    html = str(t)

  File "/usr/lib64/python2.4/site-packages/Cheetah/Template.py", line 982, in __str__
    def __str__(self): return getattr(self, mainMethName)()

  File "/var/www/vhosts/visitflanders/htdocs/do/tmpl/ecco/outer.py", line 503, in respond
    self.main(trans=trans)

  File "/var/www/vhosts/visitflanders/htdocs/do/tmpl/ecco/upcoming.py", line 450, in main
    self.content(trans=trans)

  File "/var/www/vhosts/visitflanders/htdocs/do/tmpl/ecco/upcoming.py", line 307, in content
    if VFFSL(SL,"i.li_datetime",True) > VFN(VFFSL(SL,"util",True),"format_current_date",False)(): # generated from line 101, col 7

TypeError: can't compare datetime.datetime to NoneType