Cannot read properties of undefined (reading n )

[pulze]

Hello!

I’m having trouble where our users try to verify their email address, it gets verified, however the post verification link that redirects them to our website come with a query payload like this : example.com/verify?supportSignUp=true&supportForgotPassword=true&email=user@email.adr&message=Cannot+read+properties+of+undefined+(reading+‘n’)&success=false&code=unknown

Anyone know why this could be?
Or point me in the direction on how to debug this?

[rueben.tiow]

Hi @pulze,

Welcome to the Auth0 Community!

It seems that the error is suggesting that there is bit of code that is trying to read n from a null object.

Could you check to see if you have any piece of code referencing n?

And could you see if redirecting your users to {{ application.callback_domain }} produces a different result?

Thanks,
Rueben

[pulze]

I have found the issue, the template and/or our implementation of it was outdated.
We have a MondgoDB database connected.
The MongoDB verify actions script template goes the following:

function verify (email, callback) {
  const MongoClient = require('mongodb@3.1.4').MongoClient;
  const client = new MongoClient('mongodb://user:pass@localhost');

  client.connect(function (err) {
    if (err) return callback(err);

    const db = client.db('db-name');
    const users = db.collection('users');
    const query = { email: email, email_verified: false };

    users.update(query, { $set: { email_verified: true } }, function (err, result) {
      client.close();

      if (err) return callback(err);
      callback(null, result.result.n > 0);
    });
  });
}

There is the result.result.n is the one throwing the error, while the document update itself runs perfectly, and successfully.

The mongodb@3.1.4 signals that its too old, so i’ve used “mongodb” instead, to get the latest.

The fix was to update the code with the following :

users.updateOne(query, { $set: { email_verified: true } }, function (err, result) {
      client.close();

      if (err) return callback(err);
      callback(null, result.modifiedCount > 0);
    });

TLDR;
update to updateOne, and result.result.n to result.modifiedCount.

[rueben.tiow]

Hi @pulze,

Thanks for the update, and I’m glad that you have resolved the issue!

Feel free to reach out to us again if you have any additional questions.

Thanks,
Rueben