As The error was carried out from the god Indra, he grants Hanuman a desire that his overall body might be as solid as Indra's Vajra, Which his Vajra may not damage him. Together with Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish https://hanumantemplesouthaustralia.blogspot.com/2024/07/experience-serenity-at-hanuman-mandir.html