BridgeDB doesn't like non-UTF8 encoded requests

I stumbled upon the following exception in BridgeDB's log:

Traceback (most recent call last):
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/http.py", line 1755, in dataReceived
    finishCallback(data[contentLength:])
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/http.py", line 2171, in _finishRequestBody
    self.allContentReceived()
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/http.py", line 2284, in allContentReceived
    req.requestReceived(command, path, version)
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/http.py", line 946, in requestReceived
    self.process()
--- <exception caught here> ---
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/server.py", line 235, in process
    self.render(resrc)
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/server.py", line 302, in render
    body = resrc.render(self)
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/twisted/web/resource.py", line 265, in render
    return m(request)
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/bridgedb-0.10.0+34.ga6eb0d1c.dirty-py3.7.egg/bridgedb/distributors/https/server.py", line 722, in render_POST
    return CaptchaProtectedResource.render_POST(self, request)
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/bridgedb-0.10.0+34.ga6eb0d1c.dirty-py3.7.egg/bridgedb/distributors/https/server.py", line 573, in render_POST
    request.args = stringifyRequestArgs(request.args)
  File "/home/bridgedb/virtualenvs/bridgedb/lib/python3.7/site-packages/bridgedb-0.10.0+34.ga6eb0d1c.dirty-py3.7.egg/bridgedb/distributors/https/server.py", line 109, in stringifyRequestArgs
    arg = arg if isinstance(arg, str) else arg.decode("utf-8")
builtins.UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc2 in position 1: invalid continuation byte