Clicking on "First Unread" button in forum post leads to error

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Clicking on "First Unread" button in forum post leads to error

I load a page and click on the "first unread" button...
here's a photo:

I just had that message appear too smiley

Strange... I've tried this with a couple of different accounts and don't seem to be getting an error... I'll have to investigate further.

Anyone else getting this?