As The mistake was done through the god Indra, he grants Hanuman a want that his human body might be as solid as Indra's Vajra, Which his Vajra might also not hurt him. Coupled with Indra other gods have also granted him needs: the God Agni granted Hanuman a want https://indiantempleadelaide.school.blog/2024/04/17/a-pinnacle-of-hindu-worship-in-adelaide/