diff --git a/EnvelopeGenerator.Form/frmMain.vb b/EnvelopeGenerator.Form/frmMain.vb
index 4508a631..da01bc68 100644
--- a/EnvelopeGenerator.Form/frmMain.vb
+++ b/EnvelopeGenerator.Form/frmMain.vb
@@ -201,6 +201,10 @@ Public Class frmMain
     End Sub
 
     Private Sub ViewEnvelopes_FocusedRowChanged(sender As Object, e As DevExpress.XtraGrid.Views.Base.FocusedRowChangedEventArgs) Handles ViewEnvelopes.FocusedRowChanged
+        If ViewEnvelopes.FocusedRowHandle < 0 Then
+            Exit Sub
+        End If
+
         Dim oEnvelope As Envelope = ViewEnvelopes.GetRow(ViewEnvelopes.FocusedRowHandle)
 
         If oEnvelope.IsAlreadySent Then