How to manage the no error case when handling errors in VBA?

Question

I need to catch some VBA errors using the GoTo statement:

Sub mySub
 On Error GoTo errorHandler:
    Workbooks.Open("myWorkbook")
'
' Some Code
'
errorHandler:
MsgBox "ERROR"

End Sub

The problem is that when there is no error the errorHandler section is executed.
I found this discussion but the answer doesn't solve my issue.
I tried adding an Exit Sub statement as explained :

Sub mySub
 On Error GoTo errorHandler:
    Workbooks.Open("myWorkbook")
    Exit Sub

'
' Some Code
'
errorHandler:
  MsgBox "ERROR"

End Sub

In this case it exits the method when there is no error. I also tried :

 Sub mySub
 On Error GoTo errorHandler:
    Workbooks.Open("myWorkbook")
'
' Some Code
'
errorHandler:
  MsgBox "ERROR"
  Exit Sub
End Sub

But still the same issue: The errorHandler is executed even when no errors occur.

Answer 1

Just put Exit sub in.

Sub mySub
 On Error GoTo myHandler:
    Workbooks.Open("myWorkbook")
'
' Some Code
'
Exit sub

myHandler:
MsgBox "EROOR !"

err.clear
End Sub