[Places] TypeError Crash in Places applet

Debian Lenny and up-to-date UA or Screenlets.
Crash at startup
Traceback :
Traceback (most recent call last):
  File "/usr/share/screenlets/Places/PlacesScreenlet.py", line 340, in <module>
    screenlets.session.create_session(PlacesScreenlet)
  File "/usr/lib/python2.5/site-packages/screenlets/session.py", line 472, in create_session
    session.start()
  File "/usr/lib/python2.5/site-packages/screenlets/session.py", line 254, in start
    sl.finish_loading()
  File "/usr/lib/python2.5/site-packages/screenlets/__init__.py", line 1243, in finish_loading
    self.on_init()
  File "/usr/share/screenlets/Places/PlacesScreenlet.py", line 191, in on_init
    self.update()
  File "/usr/share/screenlets/Places/PlacesScreenlet.py", line 113, in update
    self.places = [(os.environ['HOME'],'Home')]+ [(utils.get_desktop_dir(),'Desktop')] + utils.LoadBookmarks()
TypeError: can only concatenate list (not "NoneType") to list