As the error was accomplished through the god Indra, he grants Hanuman a wish that his system could be as powerful as Indra's Vajra, Which his Vajra might also not damage him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want that https://panchmukhihanumanjisydney.blogspot.com/2024/07/the-spiritual-haven-of-hanuman-mandir.html