What is the best to populate City table in django-cities-light?

I got the following error with most of the cities after running python manage.py cities_light

Saving Sous-Région du Haut-Shaba, Democratic Republic of the Congo failed: IntegrityError('null value in column "region_id" violates not-null constraint\nDETAIL: Failing row contains (44806, Sous-Région du Haut-Shaba, Sous-Region du Haut-Shaba, sous-region-du-haut-shaba, 923173, , Sous-Région du Haut-Shaba, Democratic Republic of the Congo, 923173, 40, null).\n',)