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This was fixed in the latest django-mptt version (just released 0.6.rc2), so if you’re able to upgrade it should address your problem.
You’ll need to install from git, since 0.6 isn’t on PyPi yet, or wait another week or so for the final 0.6 release.
For reference the ticket was https://github.com/django-mptt/django-mptt/issues/170
Source:stackexchange.com