As the error was done from the god Indra, he grants Hanuman a want that his human body might be as potent as Indra's Vajra, Which his Vajra may not damage him. In addition to Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://hindutemplesouthaustralia.blogspot.com/2024/06/hanuman-mandir-adelaide-embracing.html/