-        thumbnail_id = self._search_regex(
-            r'<meta name="thumbnail" content="uri:irus:(.*?)" />', webpage, 'thumbnail')
-        thumbnail = 'http://img.rasset.ie/' + thumbnail_id + '.jpg'
+        thumbnail = None
+        thumbnail_meta = self._html_search_meta('thumbnail', webpage)
+        if thumbnail_meta:
+            thumbnail_id = self._search_regex(
+                r'uri:irus:(.+)', thumbnail_meta,
+                'thumbnail id', fatal=False)
+            if thumbnail_id:
+                thumbnail = 'http://img.rasset.ie/%s.jpg' % thumbnail_id