Why does comparing password hashes in the controller with bcrypt fail?

Question

JavaScript

I store password hashes in Mongu. During the LOGIN, I check the hashes and if ok, I return the status. At first everything worked, but now for some reason it stopped, and I did not change the code. Where is the error here?

exports.login = function (req, res, next) {
  User.findOne({ email: req.body.email }, function (err, user) {
    // DB error
    if (err) {
      res.send({
        type: false,
        data: "Error occured: " + err
      })
    } else {
      if (user) {
        user.comparePassword(req.body.password, function (err, isMatch) {
          if (err) {
            res.send('wierd error')
          }
          if (!isMatch) {
            console.log(isMatch)
            res.status(422).send({error: 'Wrong password'})
            // res.send('wrong password')
          } else {
            res.status(201).send({
              user: user, // test
              // id_token: createIdToken(user),
              access_token: createAccessToken(user),
              // token: createIdToken(user),
              data: req.body
            })
          }
        })
      } else {
        res.status(422).send({error: 'The user is not registered'})
        // res.send({
        //   type: false,
        //   data: "The user is not registered"
        // })
      }
    }
  })
}

The problem is that for some reason in this controller isMatch is false.

userSchema.methods.comparePassword = function (candidatePassword, callback) {
  bcrypt.compare(candidatePassword, this.password, function (err, isMatch) {
    if (err) {
      console.log('err')
      return callback (err)
    }
    console.log('ok')
    callback (null, isMatch)
  })
}

There seems to be a gap in this bcrypt function