UnhandledPromiseRejectionWarning: Error: The client is closed on NodeJS - node.js

Question

I am trying to add Redis to my website for session management but I get the below error:
UnhandledPromiseRejectionWarning: Error: The client is closed
Below is my code:
I have kept only the relevant redis lines to avoid verbosity.
const express = require('express');
const app = express();
const session = require('express-session');
const redis = require('redis');
const connectRedis = require('connect-redis');
const RedisStore = connectRedis(session)
const redisClient = redis.createClient({
host: 'localhost',
port: 6379
})
redisClient.on('error', function (err) {
console.log('Could not establish a connection with redis. ' + err);
});
redisClient.on('connect', function (err) {
console.log('Connected to redis successfully');
});
app.use(session({
store: new RedisStore({ client: redisClient }),
secret: 'secret$%^134',
resave: false,
saveUninitialized: false,
cookie: {
secure: false, // if true only transmit cookie over https
httpOnly: false, // if true prevent client side JS from reading the cookie
maxAge: 1000 * 60 * 10 // session max age in miliseconds
}
}))
app.use(
session({
name: 'AuthCookie',
secret: 'some secret string!',
resave: false,
saveUninitialized: true
})
);
app.listen(port, () => {
console.log("We've now got a server!");
console.log('Your routes will be running on http://localhost:3000');
});
I read that I should add await client.connect() but I am not sure