Node.js web application doesn't work after deploying on heroku - node.js

Question

I am new to MERN stack development. I made a MERN project, a social media app. I finished and deployed it. It works fine only in chrome browser on my laptop (which I used for development) and when I tried to test on other browser, it just loads and shows blank, with error :
redux.js:653 Uncaught TypeError: Cannot read properties of undefined (reading 'apply').
How do I troubleshoot this ?
Here's package file for DevComm :
{
"name": "devcomm",
"version": "1.0.0",
"description": "social network for developers",
"main": "server.js",
"engines": {
"node": "14.17.3"
},
"scripts": {
"client-install": "npm install --prefix client",
"start": "node server.js",
"server": "nodemon server.js",
"client": "npm start --prefix client",
"dev": "concurrently \"npm run server\" \"npm run client\"",
"heroku-postbuild":
"NPM_CONFIG_PRODUCTION=false npm install --prefix client && npm run build --prefix client"
},
"author": "Adarsh",
"license": "MIT",
"dependencies": {
"bcryptjs": "^2.4.3",
"body-parser": "^1.19.2",
"concurrently": "^7.0.0",
"express": "^4.17.3",
"gravatar": "^1.8.2",
"jsonwebtoken": "^8.5.1",
"mongoose": "^6.2.6",
"passport": "^0.5.2",
"passport-jwt": "^4.0.0",
"validator": "^13.7.0"
},
"devDependencies": {
"nodemon": "^2.0.15"
}
}