Does the prayer of the one being led become void if the Imam makes a mistake in reciting Al-Fatiha by saying: "غير المغطوب عليهم" (ghayril-maghtoobi 'alayhim) instead of "غير المغضوب عليهم" (ghayril-maghdoobi 'alayhim)?

If the melody in Al-Fatihah, by changing the letter Dad to Taa in "Al-Maghdoub," is a melody that invalidates the recitation, then the congregant must alert the Imam. If the Imam corrects the error, his prayer and the prayer of the congregants are valid. However, if he does not correct it, then his prayer and the prayer of those who followed him become invalid according to many scholars, unless the congregant is excused, in which case his prayer is valid according to Sheikh Al-Islam Ibn Taymiyyah. The more cautious approach for the congregant is to repeat the prayer if the Imam does not correct his error.