apport doesn't launch on program crashing

When launching gaphor-0.10.4-1ubuntu1 I got this:

Traceback (most recent call last):
  File "/usr/bin/gaphor", line 8, in <module>
    load_entry_point('gaphor==0.10.4', 'console_scripts', 'gaphor')()
  File "/var/lib/python-support/python2.5/gaphor/__init__.py", line 75, in main
    import ui
  File "/var/lib/python-support/python2.5/gaphor/ui/__init__.py", line 18, in <module>
    import stock
  File "/var/lib/python-support/python2.5/gaphor/ui/stock.py", line 9, in <module>
    from gaphor import UML
  File "/var/lib/python-support/python2.5/gaphor/UML/__init__.py", line 3, in <module>
    from gaphor.UML.uml2 import *
  File "/var/lib/python-support/python2.5/gaphor/UML/uml2.py", line 3, in <module>
    from properties import association, attribute, enumeration, derivedunion, redefine
  File "/var/lib/python-support/python2.5/gaphor/UML/properties.py", line 30, in <module>
    from zope import component
ImportError: cannot import name component

and the attached crash report but the apport window asking to send the bug report didn't appeared.
/var/log/apport.log is empty.

apport-0.97
linux-image-2.6.22-11-generic

I am using gutsy.