Very weak or denounced — not to be relied upon or attributed to the Prophet ﷺ with certainty.
Narrated Ibn 'Umar: The Messenger of Allah (ﷺ) never combined the sunset and night prayers while on a journey except once. Abu Dawud said: This has been narrated by Ayyub from Nafi' from Ibn 'Umar as a statement of Ibn 'Umar. Ibn 'Umar was never seen combining these two prayers except on the night he was informed about the death of Safiyyah. The tradition narrated by Makhul from Nafi' indicates that he (Nafi') saw Ibn 'Umar doing so once or twice