Bug? - NS_ERROR_NOT_INITIALIZED: in browser console

[Kuromi]

Hello, currently i have latest No Scrip (2.9.0.4rc1) instaled in almost latest Nightly (47.0a1 (2016-03-05)) on Xubuntu 15.10 64bit, no e10s enabled.
So, the problem is that after some extended time of browser running i starting to get hordes of error messaged that is seems related to NoScript
This that Browser Console gives me
NS_ERROR_NOT_INITIALIZED: noscriptOverlay.js0
noscriptOverlay<._syncUIReal() noscriptOverlay.js:1481
noscriptOverlay<.observer.observe() noscriptOverlay.js:2189
ns.syncUI() noscriptService.js:3792
MainContentPolicy.shouldLoad() Policy.js:706
<anonymous> /:2596
<anonymous> /:2594

Its not look like this error really affecting anything and i dont really know how to reproduce it (except its comes on its own after hours of browsing and browser running)
Browser restart usually helps to fight it, but it will return later again.