As the error was done via the god Indra, he grants Hanuman a wish that his human body could well be as sturdy as Indra's Vajra, and that his Vajra may not harm him. In addition to Indra other gods have also granted him wishes: the God Agni granted Hanuman https://hindutempleinadelaide.blogspot.com/2024/04/a-pinnacle-of-hindu-worship-in-adelaide.html