Passport.js - Serializer of user object fails during authentication

I got a problem with the Passport.js module and Express.js. This is my code and I want to use the google provider login for trying. I always get the message: Error: Failed to serialize user into session. When i tried to see what was in the serializer, I got the message "User object received by serializer" shows that the object passed to the serializer (passport.serializeUser) is an instance of Mongoose's Query, rather than a complete user object.

Error: Failed to serialize user into session
   at pass (C:\Users\vueForm\node_modules\passport\lib\authenticator.js:278:19)
   at serialized (C:\Users\vueForm\node_modules\passport\lib\authenticator.js:283:7)
   at C:\Users\vueForm\app.js:42:5
   at pass (C:\Users\vueForm\node_modules\passport\lib\authenticator.js:291:9)
   at Authenticator.serializeUser (C:\Users\vueForm\node_modules\passport\lib\authenticator.js:296:5)
   at C:\Users\vueForm\node_modules\passport\lib\sessionmanager.js:33:10
   at C:\Users\vueForm\node_modules\express-session\session\store.js:54:5
   at C:\Users\vueForm\node_modules\connect-mongo\build\main\lib\MongoStore.js:377:13
   at processTicksAndRejections (internal/process/task_queues.js:93:5)

app.use(
session({
  secret: 'secret',
  resave: false,
  cookie: { httpOnly: false, secure: true, maxAge: 60 * 60 * 1000},
  saveUninitialized: false,
  store: MongoStore.create({mongoUrl: process.env.DB_URI}),
 }))

app.use(passport.initialize());
app.use(passport.session());

connectToDatabase()

passport.serializeUser((user, done) => {
 console.log("User objet get by serializer :", user);
 done(null, user._id);
});


passport.deserializeUser(function(id, done) {
  User.findOne(id, function (err, user) {
  done(err, user);
  });
});


passport.use(
new GoogleStrategy({
  clientID: process.env.Google_clientID,
  clientSecret: process.env.Google_clientSecret,
  callbackURL: '/auth/google/callback',
},
async (accessToken, refreshToken, profile, done) => {
    console.log("Info send to Google :", profile);
    const existingUser = User.findOne({
      providerId: profile.id,
    })
    if (existingUser) {
        return done(null, existingUser);
    } else {
    const user = await new User({
      googleId: profile.id,
      displayName: profile.displayName,
      email: profile.email,
      photo: profile.photos[0].value,
      
    }).save();
    return done(null, user);
    }
})
)

app.get('/auth/google', passport.authenticate('google', { scope: ['profile', 'email'] }));

app.get('/auth/google/callback', (req,res,next)=>{
passport.authenticate('google', { failureRedirect: '/auth/google/error' }, async (error, user , info) => {
  if (error){
    return res.send({ message:error.message });
  }
  if (user){
    try {
      return res.send({
        data: result.data,
        message:'Login Successful' 
      });
    } catch (error) {
      return res.send({ message: error.message });
    }
  }
})(req,res,next);

res.redirect(`http://localhost:8080/home}`);
});

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