[LiveUser] How to get an existing LiveUser instance ?

Hi, I tried to use LiveUser package in my application. I've a problem because I call LiveUser::factory() twice and the second call generates an error. What I whould like to do is to automaticaly get an existing instance of LiveUser or create it if it doesn't exist. Is it possible in LiveUser package or should I create my own singleton to be sure that only one instance of LiveUser exists ? Thank you Stephane