As the error was done from the god Indra, he grants Hanuman a wish that his overall body would be as solid as Indra's Vajra, and that his Vajra can also not damage him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman https://hanumantempleinadelaide.news.blog/2024/08/08/the-construction-of-hanuman-mandir-a-communitys-spiritual-journey/