As the mistake was done from the god Indra, he grants Hanuman a wish that his human body would be as powerful as Indra's Vajra, and that his Vajra might also not harm him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman https://medium.com/@jameag789/hanuman-mandir-a-spiritual-haven-in-south-australia-a2b74e538bc6