'GeopositionField' object has no attribute '_get_val_from_obj

[iforvard]

django-geoposition/geoposition/fields.py

Line 50 in b68382b

value = self._get_val_from_obj(obj)

When trying to execute dumpdata command
CommandError: Unable to serialize database: 'GeopositionField' object has no attribute '_get_val_from_obj'