error handling using winston not returning response

I am using winston error handling in Node.js application

var logConfig={
    level:'info',
    timestamp:true,
    colorize:true,
    handleExceptions=true
};
logger = new (winston.Logger)({
    transports: [
  new (winston.transports.Console)(logConfig)
]
  });      
}    
logger.exitOnError=false;

Apart from logging I want to use the error handling feature of winston. It is an express app

I can see winston handles the error properly, prints the stacktrace and prevents the server from crashing, but the response never come back to browser. Is there a way to specify this behavior?

Thanks