Error when trying to unsubscribe from all build emails

When you click in the link to unsubscribe from all, in the email, e.g: https://travis-ci.com/account/preferences/unsubscribe?repository=15777183&utm_medium=notification&utm_source=email

The following happens:

Hey @marimeireles,

Please check and see if this is still an issue - as it seems to be working for me.

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