As The mistake was done because of the god Indra, he grants Hanuman a would like that his human body would be as sturdy as Indra's Vajra, and that his Vajra may also not hurt him. As well as Indra other gods have also granted him wishes: the God Agni https://hindutempleinadelaide.blogspot.com/2024/07/embracing-teachings-of-lord-shanidev-at.html