NPE in suggestWidget

[alexdima]

• in a JS file, find all references of a variable
• double click inside the mini-editor

TypeError: Cannot read property 'className' of null
    at _findClassName (dom.js:55)
    at Object.toggleClass (dom.js:149)
    at SuggestWidget.setState (suggestWidget.js:303)
    at suggestWidget.js:242
    at Promise_ctor.CompletePromise_done [as done] (winjs.base.raw.js:1782)
    at Object.notifySuccess [as _notify] (winjs.base.raw.js:1448)
    at Object.state_success_notify.enter (winjs.base.raw.js:1127)
    at Promise_ctor.WinJS.Class.define._run (winjs.base.raw.js:1343)
    at Promise_ctor.WinJS.Class.define._completed (winjs.base.raw.js:1311)