TypeError - Cannot read properties of undefined (reading 'querystring')

[prachimore1406]

I'm facing this error while testing the Lambda@edge function with a CF distribution:

=====================================================================
From the Lambda logs -

Response
{
"errorType": "TypeError",
"errorMessage": "Cannot read properties of undefined (reading 'querystring')",
"trace": [
"TypeError: Cannot read properties of undefined (reading 'querystring')",
" at Authenticator.handle (/var/task/node_modules/cognito-at-edge/dist/index.js:511:64)",
" at Runtime.exports.handler (/var/task/index.js:11:52)",
" at Runtime.handleOnceNonStreaming (file:///var/runtime/index.mjs:1173:29)"
]
}

503 ERROR
The request could not be satisfied.
The Lambda function associated with the CloudFront distribution is invalid or doesn't have the required permissions. We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner.

Lambda function:

const { Authenticator } = require('cognito-at-edge');

const authenticator = new Authenticator({
// Replace these parameter values with those of your own environment
region: 'us-east-1', // user pool region
userPoolId: 'xxx', // user pool ID
userPoolAppId: 'xxxx', // user pool app client ID
userPoolDomain: 'xxxx', // user pool domain
});

exports.handler = async (request) => authenticator.handle(request);
Can someone assist in addressing this please.