As the error was accomplished because of the god Indra, he grants Hanuman a would like that his overall body can be as solid as Indra's Vajra, Which his Vajra could also not hurt him. Coupled with Indra other gods have also granted him wishes: the God Agni granted Hanuman https://vietbizdirectory.com/listings13289450/the-2-minute-rule-for-hanuman