How to simulate a 500 error?

Question

Express.js

Hello! There is such a function:

module.exports.postUser = (req, res) => {
  const { name, about, avatar } = req.body;
  User.create({ name, about, avatar })
    .then(user => res.send(user))
    .catch((e) => res.status(500).send(e));
};

on the client side, the data is filled in and gets into this function. How can I make it give the server an error? I can get a client error, but I don’t know what needs to be broken in the server code so that it gives an error