Trying to read titles from urls in google spreadsheet -

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i've created function call title of given url google spreadsheets. now, seems inconsistent refresh code , works , following error same url worked previously:

typeerror: cannot read property "title" undefined.

i mean, links have titles not sure means? works, doesn't..

   function grabtitle(url) {           var response = urlfetchapp.fetch(url);           var doc = xml.parse(response.getcontenttext(),true);           var title = doc.html.head.title.gettext();       if (title == '') {         return "unknown";       }         else {           return title;           }     }


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