As the error was done through the god Indra, he grants Hanuman a desire that his system would be as strong as Indra's Vajra, and that his Vajra may not hurt him. Together with Indra other gods have also granted him needs: the God Agni granted Hanuman a wish that https://listedirectory.com/listings835419/helping-the-others-realize-the-advantages-of-hanuman