Uploading file using multer triggers process.on('SIGINT') - node.js

Question

When I upload file using multer nodemon restarts web server. It's fine on my local machine which is windows. It only happens when I start my server on ubuntu machine. What's the problem? My code is here below.
const path = require("path");
const multer = require("multer");
const storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, path.join(__dirname, '../public/uploads/'))
},
filename: function (req, file, cb) {
cb(null, file.originalname)
}
});
function checkFileType(file, cb) {
const filetypes = /jpeg|jpg|png|gif/;
const extname = filetypes.test(path.extname(file.originalname).toLowerCase());
const mimetype = filetypes.test(file.mimetype);
if (mimetype && extname) {
return cb(null, true);
} else {
cb('Only images! jpeg|jpg|png|gif ');
}
}
const upload = multer({
storage: storage,
limits: { fileSize: 5242880 },
fileFilter: function (_req, file, cb) {
checkFileType(file, cb);
}
});
router.route('/upload').post(protect, upload.array('banner', 12), (req, res, next) => {
console.log(req.files)
if (!req.files) {
res.status(400).json({ success: false, message: 'File not found' });
return;
}
const data = [];
const baseUrl = `THE_URL_FILE_UPLOAD`;
req.files.map((file, idx) => {
data.push({ path: baseUrl + file.originalname })
})
res.status(200).json({ success: true, data })
});