Chairs (and other objects) aren't (re)moved

Steps to reproduce:
After clicking on the object (Stone chest), located in the stockpile. Then I press the F5 and get this Error.

Attachments:

develop-2720 (x64)
Uncaught TypeError: Cannot read property 'indexOf' of undefined
TypeError: Cannot read property 'indexOf' of undefined
    at null._updateMaterial (http://radiant/stonehearth/ui/game/unit_frame/unit_frame.js:112:43)
    at applyStr (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:19689:29)
    at sendEvent (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:14610:13)
    at notifyObservers (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:17805:9)
    at propertyDidChange (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:17637:7)
    at chainsDidChange (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:17733:9)
    at propertyDidChange (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:17636:7)
    at set (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:18093:25)
    at __exports__.default.Mixin.create.set (http://radiant/stonehearth/ui/root/js/libs/ember-1.8.1.js:32739:9)
    at Object.<anonymous> (http://radiant/stonehearth/ui/root/js/stonehearth/view.js:136:21)

Versions and Mods:
a13dev2720