'NoneType' object has no attribute 'get'

[rif]

I get a crash using one of my project if I am using the latest svn version. If I switch to 1.2 beta-1 the submission works fine.
When I submit a form in admin I get the following error:

'NoneType' object has no attribute 'get'
Request Method:	POST
Request URL:	http://localhost:8000/admin/pontaj/absenta/add/
Django Version:	1.2 beta 1 SVN-12881
Exception Type:	AttributeError
Exception Value:	
'NoneType' object has no attribute 'get'
Exception Location:	/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/site-packages/django/forms/models.py in _get_validation_exclusions, line 303
Python Executable:	/Users/rif/.virtualenvs/carpeDiem/bin/python
Python Version:	2.6.1
Python Path:	['/Users/rif/Documents/webframeworks/carpeDiem', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/site-packages/pip-0.6.1-py2.6.egg', '/Users/rif/.virtualenvs/carpeDiem/lib/python26.zip', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/plat-darwin', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/plat-mac', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/plat-mac/lib-scriptpackages', '/Users/rif/.virtualenvs/carpeDiem/Extras/lib/python', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/lib-tk', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/lib-old', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-mac/lib-scriptpackages', '/Users/rif/.virtualenvs/carpeDiem/lib/python2.6/site-packages']
Server time:	Mon, 29 Mar 2010 22:31:34 +0300

[Karen Tracey]

[Reformatted description. Please use preview.]

Please use WikiFormatting and please post the full contents of the text box when you press "switch to copy-and-paste view" -- what has been included here is not enough to give anyone much of an idea what might be going wrong. Some specifics of what form(s) in admin, exactly, would be helpful.

[Russell Keith-Magee]

I'm closing this as a duplicate of #13197. It's the same error message, reported by the same user, and they didn't provide any specifics there, either. However, another user managed to duplicate the problem by failing to return corrected in their clean() method. That's enough for me to call this a case of user error.

@rif - If you're reporting errors, you have to tell us *how* you generated the error. The stack trace by itself doesn't help us very much.