Error setting response headers?

Question

Node.js

There is a module that disables cors

// cors-headers
module.exports = (request, response, next) => {   
    response.set({
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'DELETE,GET,PATCH,POST,PUT',
        'Access-Control-Allow-Headers': 'Content-Type,Authorization,origin,accept'
    });
    next();
};

I use it

const express = require('express');
const corsHeaders = require('./middleware/cors-headers');
const app = express();
app.use(corsHeaders);
// .. app.get(), app.post() ...

When I send a response to the client response.send(data), a warning appears:
Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
How to treat?