Why does Excel crash on Worksheet_Change event that changes the worksheet?

Private Sub Worksheet_Change(ByVal Target As Range)Dim lrow1 As LongDim lrow2 As LongDim cell As RangeDim sell As Rangelrow1 = Sheets("Sheet1").Cells(Rows.Count, 1).End(xlUp).Rowlrow2 = Sheets("Sheet2").Cells(Rows.Count, 1).End(xlUp).RowFor Each cell In Sheets("Sheet2").Range("A1:A"& lrow2)    For Each sell In Sheets("Sheet1").Range("A1:A"& lrow1)        If cell.Value = sell.Value Then            cell.Offset(0, 1).Value = sell.Offset(0, 1).Value        End If    Next sellNext cellEnd Sub

The first entry works, brings the info correctly. With the second entry Excel crashes.