As the mistake was performed by the god Indra, he grants Hanuman a wish that his human body could well be as powerful as Indra's Vajra, and that his Vajra also can not harm him. As well as Indra other gods have also granted him wishes: the God Agni granted https://hindutemplesadelaide.blogspot.com/2024/07/experience-serenity-at-hanuman-mandir.html