A Segmentation fault is raised when ListView use objects returned by dbus
interface.

The code that reproduce the error can be found here.
https://github.com/wiliamsouza/tralha/tree/master/groups_fault

One workaround is replace the "populate" class method to:

    @classmethod
    def populate(cls):
        groups = []
        for group in GROUPS:
            new_dict = {}
            for key, value in group.items():
                if key == 'members': 
                    new_list = []
                    for list_value in value:
                        new_list.append(str(list_value))
                        new_dict[str(key)] = new_list
                        break
                new_dict[str(key)] = str(value)
            groups.append(cls(new_dict))
        return groups