How can I reach a property of an object in localStorage

I have that problem: I’m trying to reach the property of on object “user” that I save in localStorage and the browser gives me the error “Cannot read properties of undefined”.
I apply my code

 like(recipe) {
        if (this.favorites.indexOf(recipe) === -1) {
        let user = JSON.parse(localStorage.getItem("users"));
        let currFav = user.favorites;
        localStorage.setItem("users", JSON.stringify(user))