在busboy.on('file', function(fieldname, file, filename, encoding, mimetype)中添加try-catch代码块，并手动调用res.end()发送错误响应以确保问题得到处理。

示例代码：

const express = require('express');
const app = express();
const Busboy = require('busboy');

app.post('/upload', function(req, res) {
    const busboy = new Busboy({ headers: req.headers });
    const uploads = {};

    busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
        try {
            const filepath = '/path/to/save/place/' + filename;
            uploads[fieldname] = filepath;
            file.pipe(fs.createWriteStream(filepath));
        } catch (e) {
            console.error(e);
            res.status(500).end('Upload error');
        }
    });

    busboy.on('finish', function() {
        res.status(200).json({'status': 'success', 'files': uploads});
    });

    req.pipe(busboy);
});

app.listen(3000, function() {
    console.log('Listening on port 3000');
});