Is there an excuse for missing the Friday prayer and the congregational prayer if the imam is an open sinner?

Question : If the imam is an open sinner by shaving his beard, smoking, or letting his garment hang below the ankles, is that an excuse for missing the congregation?

Answer : No. If we say that the prayer behind him is invalid, as is the position of the school of jurisprudence, then it is certainly an excuse. Why would I pray behind a person behind whom my prayer is invalid? What is the benefit? So it is an excuse.