As the error was finished via the god Indra, he grants Hanuman a desire that his human body can be as strong as Indra's Vajra, and that his Vajra might also not hurt him. As well as Indra other gods have also granted him wishes: the God Agni granted Hanuman https://hanumanmandirsouthaustralia.blogspot.com/2024/08/hanuman-jayanti-2025-at-hanuman-mandir.html