JQuery Treeview causes browser crash with certain parameters

Question

I have the following code, which causes Chrome and Safari to crash (Aw Snap in Chrome)

jQuery(".filetree").treeview({
    animated: "fast",
    collapsed: true,
    unique: true,
    persist: "cookie",
    toggle: function() { }
});

If I change it to this:

jQuery(".filetree").treeview({
    animated: "fast",
    toggle: function() { }
});

It doesn't crash...any ideas?