Breaking Of A Vow And Its Kuffara
Quran speaks about vows that are made in the name of Allah and gives directives related to those vows only. However, making of a vow in any name other than Allah doesn’t fall in those directives, instead, it becomes a polytheistic act and penance should be done the way it is done in case of other polytheistic acts. If a vow has been made in name other than Allah and broken later on, then who are you offering kaffara to? and for what? Hopefully, Irfan Sahab ( @Irfan76 ) can give you a much satisfactory answer.