Express-validator not breaking on right chain - node.js

Question

I am using express-validator in nodejs. The code is always throwing first error message as a validation result.
validation.js
const { check, validationResult } = require('express-validator')
const {handleError, ErrorHandler} = require('../helper/error');
const resultsOfValidation = (req,res,next) => {
const messages = [];
const errors = validationResult(req);
if(errors.isEmpty()) {
return next(); //pass to controller
}
errors.array().map( err => messages.push(err.msg));
throw new ErrorHandler(400,messages);
}
const createUserValidator = () => {
return [
check('firstName')
.exists({ checkFalsy: true }).withMessage('First Name is mandatory')
.bail()
.isAlpha().withMessage('First Name should have all alphabets')
.bail()
.isLength({min:3}).withMessage('First Name should have minimum 3 characters')
,
check('lastName')
.optional({ checkFalsy: true }) //ignore validation when null or empty
.isAlpha()
.bail()
]
}
module.exports = {
resultsOfValidation,
createUserValidator,
}
user route is below :
const router = express.Router();
router
.get('/',getAllUsers)
.post('/',createUserValidator(),resultsOfValidation,(req,res) => console.log('created'))
.get('/:id',getUserById)
.delete('/',deleteUserById)
module.exports = router;
My user.js controller file is:
module.exports = {
getAllUsers: async (req,res)=> {},
createUser: async (req,res,next)=> {
try{
const errors = resultsOfValidation(req);
if (errors.length >0) {
throw new ErrorHandler(400, errors)
}
const { firstName, lastName } = req.body;
// call createUser from model
const user = await UserModel.createUser(firstName, lastName);
if(!user) {
throw new ErrorHandler(404, 'User not created')
}
// return res.status(200).json({ success: true, user });
} catch (error) {
return res.status(500).json({ success: false, error: error })
}
},
getUserById: async (req,res)=> {},
deleteUserById: async (req,res)=> {},
}
Here is example of post request I made. It should throw First Name should have minimum 3 characters. But I am getting other error First Name is mandatory