Breaking A Vow / Manaat That Has Shirk
There’s no kaffara for breaking a vow/mannat fulfilling of which requires shirk.
In recent Q&A Session with Ghamidi Sahab on Questions selected from ASK GHAMIDI Platform: For answer to your question, please refer to the video below from 19:24 to 21:21 https://youtu.be/99iAZeTMu-c?t=1164