Excel VBA Run time error

Question

Hi I am using your code to send a range in excel by e-mail. If I cancel the range I get a runtime error. Is it possible to add some code or msgbox to prevent this please and also to autofit the columns on attachment. Part of the code is below
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Dim xFile As String
Dim xFormat As Long
Dim Wb As Workbook
Dim Wb2 As Workbook
Dim Ws As Worksheet
Dim FilePath As String
Dim FileName As String
Dim OutlookApp As Object
Dim OutlookMail As Object
Dim WorkRng As Range
xTitleId = "Example"
Set WorkRng = Application.Selection
Set WorkRng = Application.InputBox("Range", xTitleId, WorkRng.Address, Type:=8)
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Set Wb = Application.ActiveWorkbook
Wb.Worksheets.Add
Set Ws = Application.ActiveSheet
WorkRng.Copy Ws.Cells(1, 1)
Ws.Copy
Set Wb2 = Application.ActiveWorkbook
Select Case Wb.FileFormat
Case xlOpenXMLWorkbook:
xFile = ".xlsx"
xFormat = xlOpenXMLWorkbook
Case xlOpenXMLWorkbookMacroEnabled:
If Wb2.HasVBProject Then
xFile = ".xlsm"
xFormat = xlOpenXMLWorkbookMacroEnabled
Else
xFile = ".xlsx"
xFormat = xlOpenXMLWorkbook
End If
Case Excel8:
xFile = ".xls"
xFormat = Excel8
Case xlExcel12:
xFile = ".xlsb"
xFormat = xlExcel12
End Select