ERROR:flask.app:Exception on / [POST]
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/lib/python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "searx/webapp.py", line 600, in index
    favicons=global_favicons[themes.index(get_current_theme_name())]
  File "searx/webapp.py", line 397, in render
    '{}/{}'.format(kwargs['theme'], template_name), **kwargs)
  File "/usr/lib/python3.6/site-packages/flask/templating.py", line 135, in render_template
    context, ctx.app)
  File "/usr/lib/python3.6/site-packages/flask/templating.py", line 117, in _render
    rv = template.render(context)
  File "/usr/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render
    return original_render(self, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/opt/searx/searx/templates/oscar/results.html", line 9, in top-level template code
    {%- macro search_url() %}{{ base_url }}?q={{ q|urlencode }}{% if selected_categories %}&categories={{ selected_categories|join(",") | replace(' ','+') }}{% endif %}{% if pageno > 1 %}&pageno={{ pageno }}{% endif %}{% if time_range %}&time_range={{ time_range }}{% endif %}{% if current_language != 'all' %}&language={{ current_language }}{% endif %}{% endmacro -%}
  File "/opt/searx/searx/templates/oscar/base.html", line 82, in top-level template code
    {% block content %}
  File "/opt/searx/searx/templates/oscar/results.html", line 109, in block "content"
    {% include 'oscar/infobox.html' %}
  File "/opt/searx/searx/templates/oscar/infobox.html", line 7, in top-level template code
    {% if infobox.img_src %}<img class="img-responsive center-block infobox_part" src="{{ image_proxify(infobox.img_src) }}" alt="{{ infobox.infobox }}" />{% endif %}
  File "searx/webapp.py", line 301, in image_proxify
    h = new_hmac(settings['server']['secret_key'], url.encode('utf-8'))
  File "/opt/searx/searx/utils.py", line 390, in new_hmac
    return hmac.new(bytes(secret_key, 'utf-8'), url, hashlib.sha256).hexdigest()
TypeError: encoding without a string argument
INFO:werkzeug:<requestip> - - [23/May/2019 15:24:43] "POST / HTTP/1.1" 500 -