# in the front-end profile editing change event under "Update" button from `OnUpdate` to `OnUpdateAjax`
# fill the form, clear E-mail field
# press "Update" button
# confirm, that page after reload displays correct JSON data - `{"status": "FAILED","uploader_info": {"PrimaryImage": {"urls": "","names": "","sizes": ""}},"field_errors": {"Email": "Field is required"}}`