'DatabaseOperations' object has no attribute 'geo_db_type' error when doing a syncdb

When I deploy a GeoDjango app to Heroku I'm getting the following error: AttributeError: 'DatabaseOperations' object has no attribute 'geo_db_type'

I've tried quite a few things to fix it and lots of research, but still can't get rid of it. Instead of duplicating my StackOverflow question, you can see more details here.

Any help is much appreciated.

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