Uncaught TypeError: Cannot read property 'createShader' of null on Chromium 59

[autra]

Hi there \o

Description

The chromium extension makes WebGL context crash after its activation (for one origin), until the browser is restarted.

Steps

• open chromium 59 with a fresh profile
• install webgl-inspector from the store
• Visit http://www.itowns-project.org/itowns2/examples/globe.html
• activate the chromium console
• activate webgl-inspector

Expected

• The page still works correctly (you can see the texture on the globe, zoom etc)
• The page can be debugged with webgl-inspector

Actual

• My computer freeze some seconds, the page crashes with all lot of errors, the first of them being

(unknown) Uncaught TypeError: Cannot read property 'createShader' of null
    at new TexturePreviewGenerator (<anonymous>:9134:20)
    at SurfaceInspector.TextureView.inspector.setupPreview (<anonymous>:10656:30)
    at <anonymous>:7582:18

There are also a lot of warnings seemingly concerning my application (itowns), but I don't have them if I disable this extension. Full logs

• From this point on, every attempt to load this url will fail until I restart the browser, whether in this tab or another. And it seems it affect the whole origin (because http://www.itowns-project.org/itowns2/examples/3dtiles.html fails too, with other errors:

THREE.WebGLRenderer: Error creating WebGL context.
xn @ itowns.js:1
l @ itowns.js:12
i @ itowns.js:5
i @ itowns.js:12
(anonymous) @ globe.js:11

itowns.js:1 Uncaught TypeError: Cannot read property 'getExtension' of null
    at Object.get (itowns.js:1)
    at new xn (itowns.js:1)
    at new l (itowns.js:12)
    at i [as constructor] (itowns.js:5)
    at new i (itowns.js:12)
    at globe.js:11
get @ itowns.js:1
xn @ itowns.js:1
l @ itowns.js:12
i @ itowns.js:5
i @ itowns.js:12
(anonymous) @ globe.js:11

globe.html:50 Uncaught TypeError: Cannot read property 'addEventListener' of undefined
    at globe.html:50
(anonymous) @ globe.html:50

Additionnal informations

OS: Ubuntu 16.04 LTS
Device: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)

If I embed directly the script (<script src="http://benvanik.github.com/WebGL-Inspector/core/embed.js"></script>) in my webpage, it also fails, but with other errors.

I'll be happy to provide other relevant infos.