Error in a Code. Object variable or With block variable not set????

Hi All :-)

I am getting an error in my code and have no clue what is wrong?? It was working before and now I am getting this :
Run time error 91
Object variable or With block variable not set



This is the whole code:

Private Sub CommandButton1_Click()
  If Me.ComboBox1.ListIndex < 0 Then Exit Sub

  With MyRange.Cells(1).Offset(ComboBox1.ListIndex)

    .Offset(, 0).Value = ComboBox1.Value
    .Offset(, 21).Value = TextBox1.Value
    .Offset(, 19).Value = TextBox2.Value
    .Offset(, 20).Value = TextBox3.Value
    .Offset(, 25).Value = TextBox4.Value
    .Offset(, 22).Value = ComboBox29.Value
    .Offset(, 23).Value = TextBox32.Value

  
     
  End With

  Unload Me
  MsgBox "Record Updated"
  UserForm1.Show
  
End Sub

Thanks for help
Dan