Every time I open Tokens, I get...

Unhandled Exception ("RuntimeException")

Argument 1 passed to PhabricatorTokenGiven::attachObject() must implement interface PhabricatorTokenReceiverInterface, instance of PonderAnswer given, called in /home/hawksnest/phab/phabricator/src/applications/tokens/query/PhabricatorTokenGivenQuery.php on line 85 and defined

Yep, that's the entire message. It appears to cut off, but I don't know why. I've been getting this for a few months, actually, but I waited until now, as most bugs are usually caught and resolved by the time I report them, thanks to @epriestley's Time Machine.

My system automatically updates to the latest stable every morning, and there's nothing in the update logs, so I know this isn't from an already-resolved bug (probably). Also, I notice this installation of Phabricator isn't having this problem, so I'm suspecting that either the change was pushed in master, or I buggered a configuration. I haven't edited any code, though, so I don't know what could have happened.