Deep linking using BBQ plugin

问题:

I'm not sure what it is that I am doing wrong here. When I open the HTML code for it, it just crashes. Does anyone have any idea if my syntax is wrong, or I'm just fundamentally not understanding how the BBQ plugin works? Thanks so much!

$.bbq.pushState({ 
    lat: pointArray[0][0].lat(), 
    lng: pointArray[0][0].lng()
});

$(window).bind('hashchange', function(e) {
    var searchParams= e.getState();
    pointArray[0][0] = new google.maps.LatLng(searchParams.lat, searchParams.lng);    
    mapSearch(); 
}); 

$(window).trigger('hashchange');

In Chrome, it says that I am calling method pushState of undefined. Am I suppose to declare lat/lng outside before?