My website is raising this exception around 20 times a day, usually the form works fine but there are instances where this issue occur and I don\'t know why is so random.
I had the same issue in edge browser.
I have fixed this issue by changes browser setting.
Follow the instruction to fix the issue:
Go to Settings > View advanced settings > Cookies > Change to "Don't block cookies".
Close the browser and check.
I thought, it may help someone.