minio-py: AttributeError: 'NoneType' object has no attribute 'read'

Traceback (most recent call last):
  File "/home/prerender/venv/lib/python3.6/site-packages/prerender/app.py", line 129, in handle_request
    data = await cache.get(url, format)
  File "/usr/lib/python3.6/asyncio/coroutines.py", line 128, in throw
    return self.gen.throw(type, value, traceback)
  File "/home/prerender/venv/lib/python3.6/site-packages/prerender/cache/s3.py", line 47, in get
    res = await loop.run_in_executor(None, self.client.get_object, S3_BUCKET, path)
  File "/usr/lib/python3.6/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/prerender/venv/lib/python3.6/site-packages/minio/api.py", line 781, in get_object
    object_name)
  File "/home/prerender/venv/lib/python3.6/site-packages/minio/api.py", line 1486, in _get_partial_object
    preload_content=False)
  File "/home/prerender/venv/lib/python3.6/site-packages/minio/api.py", line 1900, in _url_open
    object_name).get_exception()
  File "/home/prerender/venv/lib/python3.6/site-packages/minio/error.py", line 141, in __init__
    self._handle_error_response(bucket_name)
  File "/home/prerender/venv/lib/python3.6/site-packages/minio/error.py", line 161, in _handle_error_response
    if not self._response.data:
  File "/home/prerender/venv/lib/python3.6/site-packages/urllib3/response.py", line 188, in data
    return self.read(cache_content=True)
  File "/home/prerender/venv/lib/python3.6/site-packages/urllib3/response.py", line 380, in read
    data = self._fp.read()
  File "/usr/lib/python3.6/http/client.py", line 456, in read
    return self._readall_chunked()
  File "/usr/lib/python3.6/http/client.py", line 566, in _readall_chunked
    value.append(self._safe_read(chunk_left))
  File "/usr/lib/python3.6/http/client.py", line 612, in _safe_read
    chunk = self.fp.read(min(amt, MAXAMOUNT))
AttributeError: 'NoneType' object has no attribute 'read'

When error occurs, access self._response.data in ResponseError._handle_error_response may result in another exception.