Matt Hegarty

[have commented](https://github.com/django-import-export/django-import-export/pull/1271#issuecomment-830654956)

> Suffering from this problem too, really surprised this is not handled! I'm sure you've noticed there is a [fix](https://github.com/django-import-export/django-import-export/pull/1271) for this. You are encouraged to pull the PR and...

Thanks for posting your findings. Would it be possible for you to test this with the [3.0 beta](https://pypi.org/project/django-import-export/3.0.0b4/)? I'd be interested to know if you hit the same issue, or...

> I must tell you that this import-export library not only contains problems related to the primary key column but I found the same problem with every numeric column Hi...

You can test by importing the attached (which has an empty 'isbn' field) [books.csv](https://github.com/django-import-export/django-import-export/files/8728151/books.csv)

Needs to be tested against 2.x as well

I separated the fix for the missing m2m value - now in #1439

Better documentation of API objects is required (see #1322).

I suggest search back over previous issues and Stack Overflow (if not already). If you're still stuck, please come back with more details about your setup and what you're trying...

The fix for #1449 is now in `main`, if you merge that and re-push the tests should pass.