Cannot read property 'indexOf' of undefined

[rfburn]

Title: Cannot read property ‘indexOf’ of undefined

Summary: item UI stops working for items placed in storage, randomly

Steps to reproduce:

1. place any item in designated storage spaces on the ground
2. click on items to use or place in the world
3. Error message pops up

Expected Results: Items should be usable or placeable

Actual Results:
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. (http://radiant/stonehearth/ui/root/js/stonehearth/view.js:136:21)

Notes:

Attachments:

Versions and Mods: Alpha 13 without mods

System Information: Windows 7 Ultimate

[Powerclank]

Already posted a lot of times, thanks anyway