How to disable/suppress this windows alert?

I get an alert with this message" We'll temporarily save your work, but answers on this page will not be recorded unless you come back and submit this page." every time I click on "Back" button. I noticed that this happens when I have ToC enabled in my survey. Can someone please let me know how can i handle this? I do not wish to display this alert to my respondents. I have attached the screenshot for your reference.