成功部署后，Heroku构建失败

我定期部署到Heroku，过去一切正常。然后，仅更改一行代码并将其推送到Heroku后就失败了。

我还没有更新或安装任何东西。这种行为对我来说似乎太奇怪了。

\-----> Node.js app detected
       
-----> Creating runtime environment
       
       NPM_CONFIG_LOGLEVEL=error
       NODE_ENV=production
       NODE_MODULES_CACHE=true
       NODE_VERBOSE=false
       
-----> Installing binaries
       engines.node (package.json):  12.18.1
       engines.npm (package.json):   unspecified (use default)
       
       Resolving node version 12.18.1...
       Downloading and installing node 12.18.1...
       Using default npm version: 6.14.5
       
-----> Restoring cache
       - node_modules
       
-----> Installing dependencies
       Installing node modules
       
       > [email protected] install /tmp/build_afdd9f79/node_modules/fsevents
       > node install
       
       npm ERR! Cannot read property 'length' of undefined
       
       npm ERR! A complete log of this run can be found in:
       npm ERR!     /tmp/npmcache.Lt04X/_logs/2020-09-10T20_50_40_685Z-debug.log
-----> Build failed
       
       We're sorry this build is failing! You can troubleshoot common issues here:
       https://devcenter.heroku.com/articles/troubleshooting-node-deploys
       
       If you're stuck, please submit a ticket so we can help:
       https://help.heroku.com/
       
       Love,
       Heroku
       
 !     Push rejected, failed to compile Node.js app.
 !     Push failed

package.json如下：

{
    "private": true,
    "scripts": {
        "dev": "npm run development",
        "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch": "npm run development -- --watch",
        "watch-poll": "npm run watch -- --watch-poll",
        "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
        "prod": "npm run production",
        "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "build": "npm run production",
        "postinstall": "npm run prod",
        "heroku-postbuild": "npm run prod"
    },
    "devDependencies": {
        "axios": "^0.19.2",
        "bootstrap": "^4.5.0",
        "browser-sync": "^2.26.7",
        "browser-sync-webpack-plugin": "^2.2.2",
        "cross-env": "^5.1",
        "jquery": "^3.5.1",
        "laravel-mix": "^4.0.7",
        "lodash": "^4.17.13",
        "popper.js": "^1.16.1",
        "resolve-url-loader": "^2.3.1",
        "sass": "^1.26.9",
        "sass-loader": "7.*",
        "vue": "^2.6.11",
        "vue-template-compiler": "^2.6.11"
    },
    "dependencies": {
        "@chenfengyuan/vue-number-input": "^1.2.1",
        "country-list": "^2.2.0",
        "moment": "^2.27.0",
        "vue-cool-lightbox": "^2.5.1",
        "vue-loading-overlay": "^3.3.2",
        "vue-moment": "^4.1.0",
        "vue-recaptcha": "^1.3.0",
        "vue-resource": "^1.5.1",
        "vue-router": "^3.3.4",
        "vue-select": "^3.10.3",
        "vue-stripe-elements-plus": "^0.3.2",
        "vuex": "^3.4.0"
    },
    "engines": {
        "node": "12.18.1"
    }
}

这可能是什么原因？