Does Charm Person spell ends if Polymorph is cast on the charmed humanoid?

@JeremyECrawford Does Charm Person spell ends if Polymorph is cast on the charmed humanoid? Or does Polymorph suppress the spell called Charm Person until the human form returns?

— Draconis (@DerynDraconis) November 17, 2017

There's no rule governing what happens when a valid spell target temporarily becomes an invalid target. A good rule of thumb is that the spell is suppressed while the target is invalid. #DnD https://t.co/C4XCgFwMkE

— Jeremy Crawford (@JeremyECrawford) November 17, 2017