ReactJS randomly Unexpected token '<'

Question

Project was created with create-react-app. Did not eject. There are no webpack configs. Default "react-scripts": "^3.4.0". On dev version there is no error. But on production when user stays long on one page and clicks the link it shows white page, and after updating the site(deploying new version). This error randomly appears. Output on console

Unexpected token '<'

and no other information.

There is my package.json

{
  "name": "project-name",
  "version": "2.0.0",
  "description": "description",
  "private": true,
  "dependencies": {
    "@bugsnag/js": "^6.5.0",
    "@bugsnag/plugin-react": "^6.5.0",
    "@glidejs/glide": "^3.4.1",
    "@material-ui/core": "^4.4.1",
    "@sentry/browser": "^5.11.2",
    "@sentry/cli": "^1.49.0",
    "@types/jest": "^25.1.3",
    "@types/node": "^13.7.4",
    "@types/rc-switch": "^1.9.0",
    "@types/react": "^16.9.22",
    "@types/react-dom": "^16.9.5",
    "axios": "^0.19.0",
    "chart.js": "^2.9.1",
    "classnames": "2.2.6",
    "debounce-promise": "^3.1.2",
    "formik": "^1.5.8",
    "jquery": "^3.4.1",
    "logrocket": "^1.0.6",
    "logrocket-react": "^4.0.1",
    "moment": "2.24.0",
    "moment-timezone": "^0.5.27",
    "orgchart": "^2.1.5",
    "prop-types": "^15.7.2",
    "purgecss": "^1.4.0",
    "rc-switch": "^1.9.0",
    "react": "^16.9.0",
    "react-autosuggest": "^9.4.3",
    "react-chartjs-2": "^2.7.6",
    "react-circular-progressbar": "^2.0.2",
    "react-contextmenu": "^2.11.0",
    "react-data-export": "^0.6.0",
    "react-datepicker": "^2.9.6",
    "react-dom": "^16.9.0",
    "react-dropzone-component": "^3.2.0",
    "react-intl": "2.4.0",
    "react-perfect-scrollbar": "^1.5.3",
    "react-redux": "7.1.1",
    "react-router-dom": "^5.0.1",
    "react-scripts": "^3.4.0",
    "react-select": "^3.0.4",
    "react-select-async-paginate": "^0.3.10",
    "react-table": "latest",
    "react-transition-group": "^4.3.0",
    "reactstrap": "^8.0.1",
    "redux": "^4.0.4",
    "redux-saga": "^1.0.5",
    "styled-components": "^5.0.0",
    "tailwindcss": "^1.1.2",
    "typescript": "^3.8.2",
    "xlsx": "^0.15.5",
    "yup": "^0.27.0"
  },
  "scripts": {
    "start": "yarn run tailwind && react-scripts start",
    "build": "yarn run tailwind && node ./purge-tailwindcss.js && cross-env react-scripts build",
    "tailwind": "./node_modules/.bin/tailwind build ./src/assets/css/vendor/tailwind.base.css -c ./tailwind.js -o ./src/assets/css/vendor/tailwind.css",
    "test": "react-scripts test --env=node",
    "crt": "bash create-component.sh",
    "eject": "react-scripts eject",
    "lint": "eslint src/**/*.js"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ],
  "devDependencies": {
    "babel-plugin-import": "^1.13.0",
    "cross-env": "^5.2.0",
    "eslint": "^6.8.0",
    "eslint-config-airbnb": "^18.0.1",
    "eslint-plugin-import": "^2.20.0",
    "eslint-plugin-jsx-a11y": "^6.2.3",
    "eslint-plugin-react": "^7.18.0",
    "eslint-plugin-react-hooks": "^1.7.0",
    "node-sass": "^4.12.0",
  }
}

Answer 1

Don't know how. But after enabling sourcemap this error doesn't shown. I removed this command from yarn build:

GENERATE_SOURCEMAP=false