Can't edit post

[dandv]

When trying to edit http://crater.io/posts/42tSdwQ9nmxnf8WPx, I get

Uncaught Error: Server sent add for existing id: 42tSdwQ9nmxnf8WPx
88d60948c521b0a344d872f9ce94fc6c54684091.js:561 //Disallowed property detected: categories.0
88d60948c521b0a344d872f9ce94fc6c54684091.js:3 Exception while simulating the effect of invoking 'editPost' e.makeErrorType.r {error: "disallowed_property", reason: "Disallowed property detected: categories.0", details: undefined, message: "Disallowed property detected: categories.0 [disallowed_property]", errorType: "Meteor.Error"…} Error: Disallowed property detected: categories.0 [disallowed_property]
    at http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:561:5306
    at Array.forEach (native)
    at http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:561:5149
    at Function.A.each.A.forEach (http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:1:1009)
    at Meteor.methods.editPost (http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:561:5120)
    at http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:44:14805
    at t.extend.withValue (http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:3:6389)
    at a.extend.apply (http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:44:14691)
    at a.extend.call (http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:44:14119)
    at http://crater.io/88d60948c521b0a344d872f9ce94fc6c54684091.js:148:31046
88d60948c521b0a344d872f9ce94fc6c54684091.js:537 e.makeErrorType.r {error: "disallowed_property", reason: "Disallowed property detected: categories.0", details: undefined, message: "Disallowed property detected: categories.0 [disallowed_property]", errorType: "Meteor.Error"…}

BTW @queso, is this the right place to raise issues about Crater? I only see two open issues.