After Magento upgrades to its latest version, no success and error messages are seen to be added on the page message section while submitting the newsletter.

But the email gets saved on to the backend

It shows a message when reverted to luma but doesn't work on a custom theme. It was working fine before the update.

Can anyone suggest what might have caused the issue after update?

  • Are you getting any JavaScript errors ? Feb 13, 2018 at 17:05
  • check your console, if any error is there or not, if no error then try to see network tab in inspect and search 'section' how many time section got trigger and each section see, i am sure one of working fine but next section update clearing your message. if any update let me know Apr 8, 2018 at 13:05

2 Answers 2


For me this issue was being caused by the message block not being present on the page. Try loading other pages that you have modified less.

use Magento\Framework\Exception\CouldNotSaveException;

            throw new CouldNotSaveException(__('Error Message'));

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