title: Reading mongodb cursor produces - MongoError: clientcursor already in use?
body: <p>MongoError: clientcursor already in use? driver problem?</p>
  
  <pre><code>const { MongoClient } = require('mongodb');
  
  (async () =&gt; {
    const db =  await MongoClient.connect('mongodb://127.0.0.1/test');
    const cursor = db.collection('test').find();
  
    while (cursor.hasNext()) {
      const item = await cursor.next();
      console.log(item);
    }
  })().catch(console.error);
  </code></pre>
  
  <p>Produces the following error:</p>
  
  <pre><code>{ MongoError: clientcursor already in use? driver problem?
      at Function.MongoError.create (/node_modules/mongodb-core/lib/error.js:31:11)
      at /node_modules/mongodb-core/lib/connection/pool.js:497:72
      at authenticateStragglers (/node_modules/mongodb-core/lib/connection/pool.js:443:16)
      at Connection.messageHandler (/node_modules/mongodb-core/lib/connection/pool.js:477:5)
      at Socket.&lt;anonymous&gt; (/node_modules/mongodb-core/lib/connection/connection.js:331:22)
      at emitOne (events.js:115:13)
      at Socket.emit (events.js:210:7)
      at addChunk (_stream_readable.js:266:12)
      at readableAddChunk (_stream_readable.js:253:11)
      at Socket.Readable.push (_stream_readable.js:211:10)
    name: 'MongoError',
    message: 'clientcursor already in use? driver problem?',
    ok: 0,
    errmsg: 'clientcursor already in use? driver problem?',
    code: 12051,
    codeName: 'Location12051' }
  </code></pre>
  
  <p>Versions:</p>
  
  <ul>
  <li>mongodb@2.2.31</li>
  <li>mongodb-core@2.1.15</li>
  <li>node v8.6.0 </li>
  </ul>
  
  <p>Did anyone solve this problem?</p>