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

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please answer these questions:
1. Is this reproducible?
2. If so, what specific steps should we take to recreate this bug? Be as detailed as possible.
This will help us to find and resolve the problem.

i have also got this a few times Bug #797936 . not quite sure what triggers it.

I experienced this bug to, with i386 and Ubuntu 11.10 daily build.
I noticed that I can reproduce this bug in this way...
Once opened Ubuntu Software Center, select Canonical Partner ( it shows my nothing white page) then if for example I search the word adobe then USC crash...

Thanks Antonio, I've been able to reproduce it the way you described. Setting to triage/medium as it doesn't seem to affect other s-c functionalities.

Hi Milton and Antonio, thanks for reporting! The fix for this one has been committed and will be available soon with the next development release of software-center in Oneiric. Please continue to report any other issues you may find, your help is much appreciated!

This bug was fixed in the package software-center - 4.1.6

---------------
software-center (4.1.6) oneiric; urgency=low

  [ Brian Murray ]
  * add in an apport package hook for software-center that adds
    software-center.log to bug reports

  [ Gary Lasker ]
  * data/ui/SoftwareCenter.ui,
    softwarecenter/app.py:
    - specify the default initial window size based on screen
      dimensions to take better advantage of the available area
  * softwarecenter/ui/gtk/appdetailsview_gtk.py:
    - display package name first in the version field per spec
  * merge lp:~weblive-dev/software-center/fix-weblive, many
    thanks to Stéphane Graber
  * softwarecenter/db/update.py:
    - don't generate thumbnail urls for screenshots in the For
      Purchase section as we no longer provide separate thumbnail
      files for these apps
  * softwarecenter/ui/gtk/softwarepane.py:
    - fix crash when searching the Canonical Partners section
      (LP: #796034)
  * softwarecenter/db/application.py:
    - fix broken details view for items in the Canonical Partners
      section when the channel is not enabled

  [ Michael Vogt ]
  * move from pyhton-central to python2
  * lp:~alexeftimie/software-center/backend-refactor,
    many thanks to Alex Eftimie (LP: #704719)
  * softwarecenter/utils.py:
    - add new generic "normalize_package_description()" helper that
      can be shared between the various UIs to normalize the package
      description
    - add generic htmlize_package_description()
  * softwarecenter/ui/gtk/widgets/description.py:
    - use "normalize_package_description()" here for the description
      building
  * fix some pyflakes warnings
  * update test/test_htmlize.py for the new htmlize_package_description()

  [ Aaron Peachey ]
  * softwarecenter/backend/reviews.py,
    softwarecenter/ui/gtk/appdetailsview_gtk.py,
    softwarecenter/ui/gtk/widgets/reviews.py:
    - fix duplication of reviews after user has submitted
      usefulness, flagged or submitted a review (LP: #794060)
 -- Michael Vogt <email address hidden> Mon, 20 Jun 2011 11:21:02 +0200