IndexError: list index out of range #7

[2019-01-30 20:32:29,178] ERROR in app: Exception on /autocomplete_suggestions [GET]
Traceback (most recent call last):
  File "/home/xppl/.local/share/virtualenvs/xppl-UCsE39NU/lib/python3.5/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/xppl/.local/share/virtualenvs/xppl-UCsE39NU/lib/python3.5/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/xppl/.local/share/virtualenvs/xppl-UCsE39NU/lib/python3.5/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/xppl/.local/share/virtualenvs/xppl-UCsE39NU/lib/python3.5/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/home/xppl/.local/share/virtualenvs/xppl-UCsE39NU/lib/python3.5/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/xppl/.local/share/virtualenvs/xppl-UCsE39NU/lib/python3.5/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/var/xppl/xppl/views.py", line 967, in autocomplete_search
    word_1 = query_tokenized[-2]
IndexError: list index out of range