software-center crashed with AttributeError in _cleanup_poster_sigs(): 'NoneType' object has no attribute 'posters'

Hi bcbc! Thanks for your bug report. The bug you describe has been fixed in the branch I have linked and should be available in the next release. Please continue to report any bugs you may find in software-center. Thanks again for your help!

This bug was fixed in the package software-center - 3.1.24

---------------
software-center (3.1.24) natty; urgency=low

  [ Gary Lasker ]
  * softwarecenter/view/widgets/thumbnail.py:
    - add missing logger definition to fix name error on
      a thumbnail download error
  * softwarecenter/utils.py,
    softwarecenter/view/appdetailsview_gtk.py,
    softwarecenter/view/softwarepane.py:
    - update Unity launcher integration implementation per
      revised approach (see LP: #670403)
  * test/test_unity_launcher_integration.py,
    test/data/<many>:
    - update unit tests per the revised approach

  [ Michael Vogt ]
  * merged lp:~mmcg069/software-center/rtl-work, many thanks
    to Matthew McGowan
  * merged lp:~mmcg069/software-center/desc-tweaks
  * merged lp:~weblive-dev/software-center/weblive-by-default, thanks
    to Stephane Graber (LP: #736227)
  * softwarecenter/view/widgets/thumbnail.py:
    - fix show/hide issue in download_and_display()
  * softwarecenter/db/reviews.py, softwarecenter/models/appstore.py:
    - deal with empty appname in the review-stats to follow the
      latest server changes
  * merged lp:~mmcg069/software-center/reviews-msg-tweaks, many thanks
    to to Matthew McGowan
  * show launcher like location for commandline only apps, thanks
    to Matthew McGowan
  * when scanning for commandline binaries take alterantives into
    account as well

  [ Kiwinote ]
  * data/new.menu.in,
    softwarecenter/view/appview.py,
    softwarecenter/view/availablepane.py,
    softwarecenter/view/catview_gtk.py:
    - only display available items in what's new (LP: #739276)
    - don't display installed items in what's new (LP: #627114)
  * softwarecenter/db/database.py:
    - don't crash when we have no axi values (LP: #737870)
  * softwarecenter/gwibber_helper.py:
    - don't crash on startup due to anything sqlite related (LP: #737220)
  * softwarecenter/log.py:
    - don't crash on startup when logfile is not writeable (LP: #688682)
  * softwarecenter/view/appdetailsview_gtk.py:
    - correctly update statusbar after cancelling a dependency dialog
  * softwarecenter/view/catview_gtk:
    - don't crash when we have no what's new carousel (LP: #736046)
  * softwarecenter/view/softwarepane.py:
    - connect 'transaction-stopped' to on_transaction_stopped rather than o_t_f
  * softwarecenter/view/widgets/reviews.py:
    - fallback to package_name if review_data contains no app_name
 -- Michael Vogt <email address hidden> Tue, 22 Mar 2011 16:03:58 +0100

I just open Software Center and then I saw this error.