line 16 goes through even though I 'm seeing it hit line 20 first :(

register.js

'use strict';
var Promise = require('bluebird');
var sqlite3 = require('sqlite3');
var db = new sqlite3.Database('testDB.db');
var validator = require('validator');
var has = require('has');

exports.index = function(req, res){
    res.render('register', {title: 'register'});
};

exports.registerUser = function(req, res){
    console.log(req.body);
    var validate = Promise.promisify(validateRegistration);
    validate(req.body)
        .then(insertNewUser(req))
        .then(res.redirect('/register'))
        .catch(function(errors){
            flagValidationError(errors);
        });
};

function flagValidationError(errors) {
    for (var key in errors) {
        console.log(errors[key]);
    }
}

function insertNewUser(req) {
    var resultArray = [];
    db.serialize(function(){
        db.run("INSERT INTO Person (email, username, password) VALUES (?, ?, ?)", [req.body.email, req.body.username, req.body.password]);
        db.each("SELECT * FROM Person", function(err, row){
            resultArray.push(row);
            console.log(row);
        });
    });
}


function validateRegistration(data, callback) {
    let errors = [];
    console.log(data);
    for (var key in data){
        if (has(data, key)) {
            if (validator.isEmpty(key)) {
                var flag = {key: new Error('field can not be empty')};
                errors.push(flag);
            }
        }
    }
    if (!validator.isEmail(data.email)) {
        errors.push({"email": new Error('Invalid email')});
    }
    if (!validator.isAlphanumeric(data.password)) {
        errors.push({"password": new Error('password must be alphanumeric')});
    }
    if (!validator.isLength(data.password, 8)) {
        errors.push({"password": new Error('password must be at least 8 characters')});
    }
    if (!validator.equals(data.password, data.confirmPassword)){
        errors.push({"confirmPassword": new Error('passwords must match')});
    }
    if (errors.length === 0) callback(null);
    callback(errors);
}