I have a List of objects stored in a session variable. But when I check to make sure the session variable is not null, it gives me a `NullReferenceException: Object reference not set to an instance of an object`.

```
if(Session["object"] == null)  //error occurs here
{
     Session["object"] = GetObject();
     return Session["object"] as List<object>;
}
else
{
    return Session["object"] as List<object>;
}

```

How can I check if the Session is null?

edit: I also tried

```
if(Session["object"] != null)

```