Investigate archive error

  File "/procedure/prozorro_sale/procedure/errors.py", line 81, in request_errors_middleware
    return await handler(request)
  File "/usr/local/lib/python3.8/site-packages/prozorro_sale/auth/__init__.py", line 26, in token_middleware
    return await handler(request)
  File "/procedure/prozorro_sale/procedure/utils.py", line 153, in accept_language_middleware
    return await handler(request)
  File "/usr/local/lib/python3.8/site-packages/prozorro_sale/auth/__init__.py", line 36, in request_type_middleware
    return await handler(request)
  File "/usr/local/lib/python3.8/site-packages/prozorro_sale/auth/__init__.py", line 42, in request_context_middleware
    return await handler(request)
  File "/procedure/prozorro_sale/procedure/errors.py", line 116, in retry_on_concurrency_error_middleware
    return await handler(request)
  File "/procedure/prozorro_sale/procedure/utils.py", line 127, in request_unpack_params
    return await handler(request, **request.match_info)
  File "/procedure/prozorro_sale/procedure/api.py", line 220, in history_view
    history_procedure = await db.read_archive(archive_id)
  File "/procedure/prozorro_sale/procedure/db.py", line 204, in read_archive
    obj.pop('_procedure_id')
AttributeError: 'NoneType' object has no attribute 'pop'
[2020-02-20T15:20:19 +0000] | aiohttp.access | INFO - "192.168.31.113 GET /api/procedures/5e4e62e40a0589fbfaaebe8b/history/5e4e62e40a0589fbfaaebe8b HTTP/1.1 500 231 - Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.106 Safari/537.36 0.002898"```