Background worker cancelling from another form

Using vb.net for an application i'm developing.  During a backgroundworker routine, I have a semi-transparent overlay form over top with a progress bar and cancel button.  However when I try to cancel I get the error: Object reference not set to an instance of an object.

How can I cancel a backgroundworker from another form?  This is my code from the second (overlay) form.

Public Class CISMapOverlay
     Private myParent As frmGMapNet

    Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadLabel2.Click
        Me.myParent.BackgroundWorker1.CancelAsync()
        Me.Hide()
    End Sub

    Public Sub New()

        ' This call is required by the designer.
        InitializeComponent()
        Me.myParent = myParent

        ' Add any initialization after the InitializeComponent() call.

    End Sub
End Class

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