Getting Errors in accessing history view

[con...@aoswebsolutions.com]

Using latest pull from github repo.

This is the error - http://dpaste.com/1ASW3TN

Some history is working, some is not.

[Dave Hall]

You have a __unicode__ or __str__ method on one of your objects that is returning None.

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[con...@aoswebsolutions.com]

Ok, I think I found something else as well.
Have a look at this - http://dpaste.com/35RPD51

Seems the Initial Version always gets this error. However The later version gets the "coercing to Unicode: need string or buffer, NoneType found" error. 

The item in line 89 is always (whenever there is some error) some image.

So right now, the values are - 

old_revision is set([<Article: Tokyo Olympic Aquatic Centre>])

item is <Image: files/image-upload/01_olympic_aquatics_center.jpg>

What do you make of this?

[Dave Hall]

Hmm, that's odd. That error can only occur if you have a model instance with a relationship to another model instance that isn't in the database, and I'm not sure how that can be possible.

Alternatively, you've actually saved a model with the primary key of NULL, which would be odd.