UnicodeDecodeError in logger.new

[Natim]

 File "~/syncto/lib/python2.7/site-packages/pyramid_tm/__init__.py", line 101, in tm_tween
    reraise(*exc_info)
  File "~/syncto/lib/python2.7/site-packages/pyramid_tm/__init__.py", line 83, in tm_tween
    response = handler(request)
  File "~/syncto/lib/python2.7/site-packages/pyramid/router.py", line 78, in handle_request
    has_listeners and notify(NewRequest(request))
  File "~/syncto/lib/python2.7/site-packages/pyramid/registry.py", line 91, in notify
    [ _ for _ in self.subscribers(events, None) ]
  File "~/syncto/lib/python2.7/site-packages/zope/interface/registry.py", line 328, in subscribers
    return self.adapters.subscribers(objects, provided)
  File "~/syncto/lib/python2.7/site-packages/zope/interface/adapter.py", line 596, in subscribers
    subscription(*objects)
  File "~/syncto/lib/python2.7/site-packages/pyramid/config/adapters.py", line 103, in derived_subscriber
    return subscriber(arg[0])
  File "~/syncto/lib/python2.7/site-packages/cliquet/initialization.py", line 346, in on_new_request
    path=event.request.path,
  File "~/syncto/lib/python2.7/site-packages/webob/request.py", line 486, in path
    bpath = bytes_(self.path_info, self.url_encoding)
  File "~/syncto/lib/python2.7/site-packages/webob/descriptors.py", line 68, in fget
    return req.encget(key, encattr=encattr)
  File "~/syncto/lib/python2.7/site-packages/webob/request.py", line 178, in encget
    return val.decode(encoding)
  File "~/syncto/lib64/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x80 in position 1: invalid start byte