jQuery cookie with JSON “undefined is not a function”

What am i doing wrong here ?

function add_to_compare(product_id){
    products = getCookie("compare_list");
    if(typeof products != "undefined" && products){
        products = jQuery.cookie( 'compare_list' );
        products = jQuery.parseJSON(products);
        new_product = {"id":product_id};
        products = {"id":product_id};
    return false;

On the first call its ok , the cookie is set and after parsing it shows like that on my console:

Object {id: 72} 

But on the second click I cannot push another item
Getting “undefined is not a function” on products.push

Start products off as an array with a single object, not a bare object:

products = [ {"id":product_id} ];

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