GetUser.ProviderUserKey gives me System.NullReferenceException

Using asp.net membership. My login.aspx page goes to the loginredirect.aspx
page after the user logs in.

For some reason "Membership.GetUser.ProviderUserKey.ToString" gives me this
error:
System.NullReferenceException: Object reference not set to an instance of an
object. at loginredirect.Page_Load(Object sender, EventArgs e)

Any reason why? I should be logged in fine.

Is there another way in which I should get the current users UserId?


.

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