well this just happened on my RAM stress test savegame
I was monitoring a footman doing workers stuff when I decided to check her backpack
accidentally clicked on the “skill tree” scroll and the error popped up
develop-2513 (x64)
Uncaught TypeError: Cannot read property '0' of undefined
TypeError: Cannot read property '0' of undefined
at App.StonehearthPromotionTree.App.View.extend._buildTree (http://radiant/stonehearth/ui/game/promotion_tree/promotion_tree.js:110:45)
at http://radiant/stonehearth/ui/game/promotion_tree/promotion_tree.js:253:18
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)
at jQuery.event.dispatch (http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:5095:9)
at elemData.handle (http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:4766:46)
at Object.jQuery.event.trigger (http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:5007:12)
at http://radiant/stonehearth/ui/root/js/libs/jquery-1.10.2.js:5691:17
right before that happened I opened the skill tree on a different Hearthling and just got a blank UI… had to F5 reset it to go on so it could be related to that
