stackoverflow exception with htmlagility pack - stack-overflow

Question

I am using the htmlagilitypack to parse an xml document. I use it to load the string as a htmldocument and then use the xmltextreader to parse. I will occasionally get an unhandled stackoverflow exception on htmlagility.dll.
The specific line is
internal Dictionary<string, Htmlattribute> Hashitems = new
Dictionary<string, HtmlAttribute>()
EDIT:
Try
Dim hdoc = New HtmlAgilityPack.HtmlDocument()
hdoc.LoadHtml(xmlsnippet)
Dim nreader As XmlTextReader = New
XmlTextReader(New StringReader(xmlsnippet))
Dim ncount As Integer = 0
While nreader.Read
If Not nreader.Name = "" Then
ncount += 1
If ncount = 18 Then
Exit While
End If
num += 1
nodelist.Add(nreader.Name)
If nreader.Name = "id" Then
statid = nreader.ReadInnerXml
End If
If nreader.Name = "published" Then
contentDate = nreader.ReadInnerXml
contentDate = Regex.Replace(contentDate, "T", " ")
contentDate = Regex.Replace(contentDate, "\+", " ")
contentDate = contentDate.Replace("Z", "")
End If
If nreader.Name = "summary" Then
ctext = nreader.ReadInnerXml
End If
If nreader.Name = "title" Then
csubject = nreader.ReadInnerXml
If csubject.Contains("posted") Then
template = csubject
author = Regex.Replace(template, "posted.*", "")
End If
If csubject.Contains("Keyword -") Then
Dim tip As String = csubject
searchterm =
Regex.Replace(csubject, "xxxxxx.*xxxxxx.*xxxx.*-", "")
searchterm =
Regex.Replace(searchterm, "xxxxx.*xxxxxx.*Search.*-", "")
Trim(searchterm)
End If
End If
End If
End While
Dim mreader As XmlTextReader =
New XmlTextReader(New StringReader(xmlsnippet))
Dim mcount As Integer = 0
While mreader.Read
If Not mreader.Name = "" Then
mcount += 1
If mcount > 15 Then
If mreader.Name = "uri" Then
authorUri = mreader.ReadInnerXml
Trim(authorUri)
If authorUri = "http://www.xxxxxxxx.com/" Then
authorUri = ""
End If
End If
If mreader.Name = "name" Then
author = mreader.ReadInnerXml
If author = "xxxxxx" Then
author = ""
End If
End If
If mreader.Name = "content" Then
htext = mreader.ReadInnerXml
End If
If mreader.Name = "link" Then
Dim address As String
address = mreader.ReadOuterXml
If address.Contains("related") Then
Dim regex12 As Regex =
New Regex("<link.*rel.*href=""(?<Link>.*?)"".*/>", RegexOptions.IgnoreCase)
Dim m12 As Match = regex12.Match(address)
himage = m12.Groups("Link").Value
ElseIf address.Contains("alternate") Then
Dim regex13 As Regex =
New Regex("<link.*rel.*href=""(?<Link>.*?)"".*/>", RegexOptions.IgnoreCase)
Dim m13 As Match = regex13.Match(address)
authorUri = m13.Groups("Link").Value
End If
End If
If mreader.Name = "subtitle" Then
hsubtitle = mreader.ReadInnerXml
End If
End If
End If
End While
Catch ex As Exception
appLogs.constructLog(ex.Message.ToString, True, True)
Exit Sub
End Try
In fact there are different stackoverflow exception errors occurring at different lines but the same error and only while using htmlagilitypack. I am in another method trying to parse the xml using xmldocument, xpathnavigator and it works fine unless I get some bad xml, then I go to this method. I have set up exception catches to just move the bad xml to a folder and then exit this method but I cannot catch these kinds of exceptions or can I?
Another line where error shows:
public string Name
{
get
{
if (_name == null)
{
Name = _ownerdocument.Text.Substring(_namestartindex, _namelength);
}
return _name != null ? _name.ToLower() : string.Empty;
on the last line in the snippet above in the file HtmlNode.cs.
The call stack window shows the top as
HtmlAgilityPack.dll!HtmlAgilityPack.HtmlNode.Name.get() Line 432 + 0x21 bytes