Error [ERR_STREAM_WRITE_AFTER_END]: write after end

Ao retornar resp.marko estou obtendo o erro abaixo. Alguém já passou por isso? Poderia auxiliar?

Obrigado.

app.post('/livros', [
    check('titulo').isLength({ min: 5 }),
    check('preco').isCurrency(),
], function (req, resp) {
    const erros = validationResult(req);
    if (!erros.isEmpty()) {
        console.log("Tá bugado!");
        return resp.marko(
            require('../views/livros/form/form.marko',
                {
                    livro: {},
                    errosValidacao: erros.array()
                }
            )
        );
    }
    console.log(req.body);
    const livroDao = new LivroDao(db);

    livroDao.adiciona(req.body)
        .then(resp.redirect('/livros'))
        .catch(erro => console.log(erro));
});

O console.log("Tá bugado!") é exibido no console, mas logo em seguida recebo o erro:

Error [ERR_STREAM_WRITE_AFTER_END]: write after end
    at write_ (_http_outgoing.js:637:17)
    at ServerResponse.write (_http_outgoing.js:629:15)
    at BufferedWriter.flush (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\BufferedWriter.js:21:27)
    at BufferedWriter.end (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\BufferedWriter.js:30:14)
    at AsyncStream._doFinish (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\AsyncStream.js:221:26)
    at AsyncStream.end (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\AsyncStream.js:263:22)
    at AsyncStream.error (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\AsyncStream.js:446:18)
    at Timeout._onTimeout (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\renderable.js:17:22)
    at listOnTimeout (internal/timers.js:549:17)
    at processTimers (internal/timers.js:492:7)
Error [ERR_STREAM_WRITE_AFTER_END]: write after end
    at write_ (_http_outgoing.js:637:17)
    at ServerResponse.write (_http_outgoing.js:629:15)
    at BufferedWriter.flush (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\BufferedWriter.js:21:27)
    at BufferedWriter.end (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\BufferedWriter.js:30:14)
    at AsyncStream._doFinish (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\AsyncStream.js:221:26)
    at AsyncStream.end (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\AsyncStream.js:263:22)
    at AsyncStream.error (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\html\AsyncStream.js:446:18)
    at Timeout._onTimeout (C:\Users\Rafael\Desktop\Learning\Node\casadocodigo\node_modules\marko\src\runtime\renderable.js:17:22)
    at listOnTimeout (internal/timers.js:549:17)
    at processTimers (internal/timers.js:492:7)