Doesn't wanna start in Debian lenny

Hi, I don't know if it's a bug but I cant start zim under debian lenny:
It says:

Traceback (most recent call last):
  File "/usr/bin/zim", line 40, in <module>
    zim.main(sys.argv)
  File "/usr/lib/python2.5/site-packages/zim/__init__.py", line 296, in main
    notebook = zim.gui.notebookdialog.prompt_notebook()
  File "/usr/lib/python2.5/site-packages/zim/gui/notebookdialog.py", line 33, in prompt_notebook
    logger.debug('First time usage - prompt for notebook folder')
NameError: global name 'logger' is not defined

Altrough the test give:

WARNING: Could not load bzrlib - falling back to calling bzr as external program
Skipping test: TestBazaar - Bazaar not found
Skipping test: TestEquationEditor - latex and/or dvipng not found
Skipping test: TestDiagramEditor - GraphViz 'dot' command not found
Test if all modules compile ... ok
runTest (tests.errors.TestErrors) ... ok
Test parsing Re class ... ok
[...]
Test Calendar plugin ... ok
Test PrintToBrowser plugin ... ok

----------------------------------------------------------------------
Ran 78 tests in 114.178s
Skipped 3 tests

OK

Thanks