As the error was finished by the god Indra, he grants Hanuman a wish that his body could be as sturdy as Indra's Vajra, Which his Vajra also can not harm him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman a desire https://emiliokfato.isblog.net/the-fact-about-hanuman-that-no-one-is-suggesting-54111078