Word VBA delete hidden bookmarks before closing - vba

Question

I want to set up a VBA so that for any document based on a template hidden bookmarks are deleted prior to the document closing. We publish documents on our website. They are written as Word and an API converts them to html. If there are hidden bookmarks they appear as links on the website (the hidden bookmarks convert to html anchors). Currently we remove the bookmarks manual prior to the API, but this is time consuming (we publish 1000s of documents a year) and ineffective (people forget).
I found VBA to remove hidden bookmarks which works and tried to add DocumentBeforeClose as the trigger. But it doesn't work:
Private Sub DocumentBeforeClose(cancel As Boolean)
Dim nBK As Long
With ActiveDocument
For nBK = .Bookmarks.Count To 1 Step -1
If LCase(Left(.Bookmarks(nBK).Name, 3)) = "_hl" Then
.Bookmarks(nBK).Delete
End If
Next nBK
End With
ActiveDocument.Save
End Sub
I went through Visual Basic Window, Normal, Microsoft Word Objects, ThisDocument.
Nothing happens, the hidden bookmarks remain if I close and re-open the document.

Answer 1

I think you need to add this line :
.Bookmarks.ShowHidden = True
Like this it should work :
Private Sub DocumentBeforeClose(cancel As Boolean)
Dim nBK As Long
With ActiveDocument
.Bookmarks.ShowHidden = True
For nBK = .Bookmarks.Count To 1 Step -1
If LCase(Left(.Bookmarks(nBK).Name, 3)) = "_hl" Then
.Bookmarks(nBK).Delete
End If
Next nBK
End With
ActiveDocument.Save
End Sub

Answer 2

This has solved it:
Sub AutoClose()
On Error Resume Next
Dim nBK As Long
With ActiveDocument
.bookmarks.ShowHidden = True
For nBK = .bookmarks.Count To 1 Step -1
If LCase(Left(.bookmarks(nBK).Name, 3)) = "_hl" Then
.bookmarks(nBK).Delete
End If
Next nBK
End With
ActiveDocument.Save
End Sub
Only issue is that it tries to run when you open a document and puts up an error message that there is no active document. 'On error resume next' is to stop that error message