Is it permissible to pray behind someone who makes du'a before the takbir of ihram, or does this prevent praying behind him?

Question:
He says: Honorable Shaykh, may Allah grant you success, is the prayer valid behind the innovators in the mosques that are on the travel route, and he gave as an example of the bid'ah (religious innovation) the du'a before the takbir of ihram?

Answer:
No, no, it does not prevent the prayer. You advise him, you tell him, because he thinks he is right and that... you tell him, do you see, there is no du'a before the takbir of ihram, a du'a, meaning aloud. As for you making du'a without raising your voice, making du'a between you and yourself, there is no harm. But raising the voice, this has not been reported. And as for praying behind them, the prayer is valid. And generally, you should have a good opinion. If you find people praying, pray with them. Do not investigate, you say, what is the state of this imam? Do not investigate anything you do not see, do not investigate it. And if you see the people doing good, do good with them, and if they do evil, avoid their evil. Yes.