As the error was performed because of the god Indra, he grants Hanuman a want that his physique would be as potent as Indra's Vajra, and that his Vajra may also not hurt him. As well as Indra other gods have also granted him needs: the God Agni granted Hanuman https://mahavidya73838.total-blog.com/the-5-second-trick-for-hanuman-chalisa-58031700