Errors while executing harvest_all

While executing harvest_all using web2py -d, the following stacktraces were printed out on the console. The Selector options were: 2014 -> 2015, no team, no project, mode:save in database, format:html Bug present in production 0.8.10.

Traceback (most recent call last):
  File "applications/track_publications/modules/harvest_tools.py", line 926, in process_url
    self.decode_xml(xml)
  File "applications/track_publications/modules/harvest_tools.py", line 973, in decode_xml
    self.load_db(record)
  File "applications/track_publications/modules/harvest_tools.py", line 1442, in load_db
    publication_url=record.paper_url(),
  File "applications/track_publications/modules/invenio_tools.py", line 2210, in paper_url
    elif 'y' not in el and el['u'].endswith(pdf):
AttributeError: 'list' object has no attribute 'endswith'