Forum Mute token for emails points to blank page

Good day forum,

It was just brought to our attention that the "mute this conversation" button option from the Forum Reply email template (this was a default link - we did not customize this) no longer works. When the user clicks it, it's going to a blank page... Not sure if things have changed in this regards, but I can't see any other tokens which would allow users to turn off notifications with a click. 

Any guidance is greatly appreciate. We are on Version 11.1.5

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