Error when unsubscribing from newsletter

Hi, I got a newsletter from the site for the first time today, and (1) I did not subscribe, (2) I cannot unsubscribe due to an error (quoted below and attached screenshot):

Application Error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail

I would like to add that I couldn’t find any options in the settings to subscribe or unsubscribe from email newsletters.

@John, this is your thing

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