As the error was performed because of the god Indra, he grants Hanuman a desire that his entire body could well be as potent as Indra's Vajra, and that his Vajra also can not harm him. Together with Indra other gods have also granted him needs: the God Agni granted https://iodirectory.com/listings13348258/the-single-best-strategy-to-use-for-hanuman