Selection/Range.MoveEndUntil crashes word when encountering a comment

Question

 have a word add-in that manipulates selected text by reformatting it in various ways (specifics not important). One function not only manipulates the selected text, but also expands the range to include text prior to the users selection up until the previous
line break. Code:
Dim rng As Microsoft.Office.Interop.Word.Range = sel.Range
With rng
.MoveEndUntil(Cset:=vbCrLf, Count:=Word.WdConstants.wdBackward)
End With
End If
So this code has been working great, unless there are comments in the range that is being expanded into, in which case word crashes without triggering any sort of error in visual studio. After experimentation, I've concluded it's the vbCrLf Cset that breaks
when it encounters a comment, since if I .MoveEndUntil a random string (i.e. "123") it moves past a comment just fine. My best guess is that the special character word inserts at comment points is interfering with vbCrLf, but I'm at a loss of how
to avoid the issue. I've also tried vbNewLine, but that produces the same problem. Mainly because in office vbCrLf = vbNewLine.
I could delete all comments in the documents, or deactivate the function if any comments exist, but it will really inhibit functionality for the end user. Any help appreciated. 

Answer 1

Hi SJLD,
I've reproduced this problem, it'll also crash the Word application in VBA code. This only happens when Count=wdBackward, not for wdForward. I think this might be some unknown issue. I'll involve some other engineer into this case. If there're any updates,
we'll come back.
Thanks for your understanding.
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