Why getting compile error on doubleclick event in a listbox

Using the following code I get a compile error: variable not defined error when doubleclicking on a record in a listbox.  When I double-click on the record it is supposed to open a form to the selected record.

Here is my code:

Private Sub List223_DblClick(Cancel As Integer)

    If IsNull(Me.List223) Then
        DoCmd.OpenForm "frmScriptureRecordEntry", , , , acFormAdd
    Else
         strCriteria = "[RecordID] = " & Me.List223.Column(0)
         DoCmd.OpenForm "frmScriptureRecordEntry", , , strCriteria

End Sub

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