My heroku app crashes when passport gives the error "a user with the given username is already registered"

My heroku app crashes when passport gives the error "a user with the given username is already registered"
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#1

hi everyone
i’m currently working on the voting app. but i’m having a problem
when i try to register with a pre-registered username and passport gives the error “a user with the given username is already registered”

my heroku app crashes , and it doesn’t restart . even though i tried "heroku ps:scale web=1"
here’s the code of my express/mongodb server:: https://github.com/BahaaZidan/ex40/tree/master/server

and here’s the heroku log .
any help is appreciated. thanks in advance.


#2
router.post('/register', (req, res) => {
  users.register(new users({ username : req.body.username }), req.body.password, (err, val) => {
    if (err) return res.status(500).json({status: `Authentication Problem :: ${err}`});
    val.save((err,user) => {
      if (err) return res.status(500).json({status: `Authentication Problem :: ${err}`});
      passport.authenticate('local')(req, res, () => { 
        return res.status(200).json({status: 'Registration Successful!'});
      });
    });
  })
});

this solved the problem.
turns out i wasn’t handling the exception i was just throwing it .