Error: ConcurrencyError: Session was updated by someone else!

[moghribalakrishna]

We're Using Session Store with couchdb and getting the following Error, Please let us know if you have any quick advice on what could be the cause or let us know if you need more details on this.

Details:
1|PGServer | Error: ConcurrencyError: Session was updated by someone else!
1|PGServer | at /home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/sessionstore/lib/databases/couchdb.js:133:25
1|PGServer | at /home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/cradle/lib/cradle/database/documents.js:73:21
1|PGServer | at Request._onResponse [as _callback] (/home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/cradle/lib/cradle.js:241:20)
1|PGServer | at Request.self.callback (/home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/request/request.js:188:22)
1|PGServer | at emitTwo (events.js:87:13)
1|PGServer | at Request.emit (events.js:172:7)
1|PGServer | at Request. (/home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/request/request.js:1171:10)
1|PGServer | at emitOne (events.js:77:13)
1|PGServer | at Request.emit (events.js:169:7)
1|PGServer | at IncomingMessage. (/home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/request/request.js:1091:12)
1|PGServer | at IncomingMessage.g (events.js:260:16)
1|PGServer | at emitNone (events.js:72:20)
1|PGServer | at IncomingMessage.emit (events.js:166:7)
1|PGServer | at endReadableNT (_stream_readable.js:913:12)
1|PGServer | at /home/ubuntu/AlienWebSite_2017:05:01/AlienWebSiteResourcesProd/AlienHuWebSite/PGServerJs/node_modules/async-listener/glue.js:188:31
1|PGServer | at nextTickCallbackWith2Args (node.js:442:9)
1|PGServer | at process._tickDomainCallback [as _tickCallback] (node.js:397:17)

[adrai]

the document in the couchdb has been updated by some other part of your code, between the time it was loaded and the time it was saved...
Probably you have parallel (web-)requests...

[yuhr]

I had been getting the same error Error: ConcurrencyError: Session was updated by someone else!, and now solved:

app.use(session({
  secret: 'test key',
  resave: false, // SETTING FALSE SOLVED THE ERROR
  store: sessionstore.createSessionStore({
    type: 'couchdb',
    host: 'localhost',
    port: 5984,
    dbName: 'express-sessions',
    collectionName: 'sessions',
    timeout: 10000
  })
}));

[rickdesantis]

This didn't solve my problem. Here's my configuration:

app.use(session({
  store: require('sessionstore').createSessionStore({
    type: 'couchdb',
    host: `${config.dbCredentials.protocol}://${config.dbCredentials.host}`,
    port: config.dbCredentials.port,
    dbName: 'sessions',
    username: config.dbCredentials.user,
    password: config.dbCredentials.password,
    timeout: 10000
  }),
  saveUninitialized: false,
  resave: false,
  secret: 'super secret key',
  cookie: {
    maxAge: 4 * 60 * 60 * 1000
  }
}))

Any suggestion?

Edit: Yes, I have parallel requests as you suggested @adrai .