I'm using Passport Local Mongoose to create a user on my database. My goal is to allow users with the same username to register into my app. On my research, i found that if i pass an object as option on my Schema.plugin with 'usernameUnique: false', i would allowed users to register with the same username. The only problem is when a try it to make a register, i get an "UserExistsError" on my console.

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const passportLocalMongoose = require('passport-local-mongoose');

const UserSchema = new Schema({
    email: {
        type: String,
        required: true,
    },
    username: {
        type: String,
        required: true,
        unique: false
    },
});

const options = {
    usernameUnique: false,
}

UserSchema.plugin(passportLocalMongoose, options);
const User = mongoose.model('User', UserSchema);

module.exports = User;