As the error was performed via the god Indra, he grants Hanuman a desire that his system would be as powerful as Indra's Vajra, and that his Vajra may also not hurt him. Along with Indra other gods have also granted him needs: the God Agni granted Hanuman a want https://griffindjjcd.madmouseblog.com/17544084/not-known-details-about-hanuman