AtmospherePushConnection Issue

Hi,
I am getting below error frequently , i had set session timeout for 15 minutes.This scenario occurs randomly but when occurs this event happens whole day.

I want my session to be timeout only after 15 minutes idle session which generally happens but sometime it doesn’t work due to below error.

widgets.CustomWidgetSet-0.js:9329 Sat Sep 30 14:46:25 GMT+530 2023 com.vaadin.client.communication.AtmospherePushConnection
INFO: Received push (long-polling) message: for(;;);[{"changes":{},"resources":{},"locales":{},"meta":{"appError":{"caption":"Session Expired","url":null,"message":"Take note of any unsaved data, and <u>click here</u> or press ESC key to continue.","details":null}},"syncId":-1}]