Does touching the private parts, if not intentional, invalidate the ablution?

Question:
He says: Honorable Shaykh, may Allah grant you success, what is the ruling on touching the private parts if this touch is incidental and not intentional? Does it invalidate the ablution?

Answer:
If it is direct contact without a barrier, and you touched it with your palm, then it invalidates the ablution, due to the generality of the hadith: "Whoever touches his private parts, let him perform ablution." But if it is through a barrier, or if you touched it with something other than your palm, there is no harm. Yes.