Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 2 months ago

This is untrue.

Infallible never prays behind a sinner. Such narrations are fabricated even if you find them in a book compiled by a Shia author. This narration is mentioned in Nawaadir Al-Raawandi, page 30 but it has no value nor any authenticity.
Wassalam.