Custom FileAdapter breaks dashboard

When adding a custom FileAdapter (works as expected) in parse-server it generated a server error in the dashboard.

"TypeError: Converting circular structure to JSON"

This seems to be the reason:

Environment Setup

node 13.0.1
npm 6.13.1
parse-dashboard 2.0.5
parse-server 4.2.0

Steps to reproduce

Add a custom fileAdapter that uses mongodb client to parse-server.

The most basic example:
ImageGridFSBucketAdapter.js

const { GridFSBucketAdapter } = require('parse-server/lib/Adapters/Files/GridFSBucketAdapter');

module.exports = class ImageGridFSBucketAdapter extends GridFSBucketAdapter {
  constructor(mongoDatabaseURI, mongoOptions = {}) {
    super(mongoDatabaseURI, mongoOptions);
  }
};

Where you start the parse-server:

const ImageGridFSBucketAdapter = require('./adapters/ImageGridFSBucketAdapter');
  const config = {
    ...
    filesAdapter: new ImageGridFSBucketAdapter(config.databaseURI),
    ...
  };

  const parse = ParseServer.start(config, async () => {
    ...
  });

(the same thing happens when you just copy the GridFSBucketAdapter instead of extending it)

Than load the dashboard, upload file using the dashboard (or your api) and refresh the dashboard.

Logs/Trace

Note: If you get a browser JS error please run npm run dev. This will provide source maps and a much more useful stack trace.
In the parse-server log and in the network request for http://localhost:1337/dashboard/parse-dashboard-config.json

TypeError: Converting circular structure to JSON
--> starting at object with constructor 'NativeTopology'
| property 's' -> object with constructor 'Object'
| property 'sessionPool' -> object with constructor 'ServerSessionPool'
--- property 'topology' closes the circle
at JSON.stringify ()
at stringify (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/response.js:1123:12)
at ServerResponse.json (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/response.js:260:14)
at /Users/wolfwood/dev/project-name/packages/apps/api/node_modules/parse-dashboard/Parse-Dashboard/app.js:133:20
at Layer.handle [as handle_request] (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/layer.js:95:5)
at /Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:281:22
at Function.process_params (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:335:12)
at next (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:275:10)
at Layer.handle [as handle_request] (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/layer.js:91:12)
at trim_prefix (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:317:13)
at /Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:335:12)
at next (/Users/wolfwood/dev/project-name/packages/apps/api/node_modules/express/lib/router/index.js:275:10)

Start at Parse-Dashboard/app.js around the response for /dashboard/parse-dashboard-config.json, using the reported JSON.stringify stack trace as the entry point. Reproduce with the custom GridFSBucketAdapter and check how its MongoDB client state reaches the dashboard response; done means the dashboard loads and refreshes after a file upload without the circular-structure error.