need to include if statement to a vba vlookup code

[xl factor]

Hello,

I have a piece of code that does a vlookup. I need to add an if statement to the same. cant seem to get it right.

The if statement is as below and the main code below it. Please help.

If Not varResult = "" Then
        rng.Value = varResult
End If

,

Sub vlookup()

Dim ws As Worksheet
Dim rng As Range
Dim varResult As Variant

Set ws = Worksheets("B1 Movements")
Set rng = ws.Range("M3")

Do
    varResult = Application.vlookup(rng.Offset(0, -10).Value, Worksheets("Movement Box").Range("C1:S100"), 17, False)
    If Not IsError(varResult) Then
        rng.Value = varResult
    End If
    Set rng = rng.Offset(1)
Loop Until rng.Offset(0, -10).Value = ""

End Sub

Thanks in advance.