Cannot read property children of undefined

[isidorn]

Refs: #57304

Windows

File > preferences > settings

Note that I could only reproduce this twice and I can no longer repro. I hope the stack trace will help you figure out what was broken.

TypeError: Cannot read property 'children' of undefined
    at e.updateGroupCount (workbench.main.js:formatted:115298)
    at e.update (workbench.main.js:formatted:115293)
    at workbench.main.js:formatted:168085
    at n.Class.define.cancel.then (workbench.main.js:formatted:8110)
    at t.renderTree (workbench.main.js:formatted:168084)
    at t.updateElementsByKey (workbench.main.js:formatted:168055)
    at t.onConfigUpdate (workbench.main.js:formatted:168020)
    at workbench.main.js:formatted:167583
    at e.fire (workbench.main.js:formatted:9029)
    at t.triggerConfigurationChange (workbench.main.js:formatted:172092)
    at t.onUserConfigurationChanged (workbench.main.js:formatted:171987)
    at workbench.main.js:formatted:171624
    at e.fire (workbench.main.js:formatted:9029)
    at workbench.main.js:formatted:66091
    at e.fire (workbench.main.js:formatted:9029)
    at workbench.main.js:formatted:15373
    at workbench.main.js:formatted:15320
    at C:\Program Files\Microsoft VS Code Insiders\resources\app\node_modules.asar\graceful-fs\graceful-fs.js:78
    at FSReqWrap.readFileAfterClose [as oncomplete] (original-fs.js:511)

[roblourens]

I've changed a lot of stuff and haven't seen this, let me know if it pops up again.