Uncaught Error: Assertion Failed: calling set on destroyed object

Title:

Summary:
Was making another party and this showed up. It was my 4th party made and I had just clicked add members.

Notes:

release-489 (x64)
Uncaught Error: Assertion Failed: calling set on destroyed object
Error: Assertion Failed: calling set on destroyed object
    at new Error (native)
    at Error.EmberError (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:14251:23)
    at Object.Ember.assert (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:3865:15)
    at set (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:18053:13)
    at __exports__.default.Mixin.create.set (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:32739:9)
    at http://radiant/stonehearth/ui/game/party_editor/party_editor.js:127:24
    at fire (http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:3048:30)
    at Object.self.fireWith [as resolveWith] (http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:3160:7)
    at deferred.(anonymous function) (http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:3249:34)
    at foward_fn (http://radiant/radiant/js/radiant/object.js:131:22)

Version Number and Mods in use:
release-489 (x64)