As the error was performed from the god Indra, he grants Hanuman a desire that his physique can be as sturdy as Indra's Vajra, and that his Vajra may not harm him. As well as Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish https://shanimandirinaustralia.blogspot.com/2024/07/the-power-and-influence-of-lord-shanidev.html