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TypeError: Cannot read property 'dispose' of undefined

See original GitHub issue

Extension version: 0.26.0
VSCode Version: 1.56.0
OS: Window 10 19042.928

Steps to Reproduce:

I don’t know exactly how I produced this except that:

I was in review mode on a PR.
After some time spend reviewing (maybe sleeping/waking the PC, etc.), I clicked back over to the “GitHub” tab
I saw this notification and the pull requests list was empty in the UI

Saw this stack trace in the inspector:

TypeError: Cannot read property 'dispose' of undefined
	at c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1005:21634
	at Array.forEach (<anonymous>)
	at c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1005:21621
	at Array.forEach (<anonymous>)
	at Md.dispose (c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1005:21581)
	at Object.dispose (c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1005:23035)
	at c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1066:402
	at Array.forEach (<anonymous>)
	at Mu.dispose (c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1066:389)
	at c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1062:1904
	at Array.forEach (<anonymous>)
	at Va.dispose (c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1062:1891)
	at c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1090:17562
	at Array.forEach (<anonymous>)
	at Wl.getChildren (c:\Users\rikki\.vscode\extensions\github.vscode-pull-request-github-0.26.0\dist\extension.js:1090:17549)
	at d.fetchChildrenNodes (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:87:61023)
	at d.getChildren (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:87:57862)
	at a.$getChildren (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:87:54839)
	at l._doInvokeHandler (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:91:12836)
	at l._invokeHandler (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:91:12520)
	at l._receiveRequest (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:91:11187)
	at l._receiveOneMessage (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:91:10172)
	at c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:91:8074
	at fire (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:57:1836)
	at S.fire (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:65:15497)
	at c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:106:29764
	at fire (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:57:1836)
	at S.fire (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:65:15497)
	at t._receiveMessage (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:65:20755)
	at c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:65:17641
	at fire (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:57:1836)
	at acceptChunk (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:65:12862)
	at c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:65:12210
	at Socket.v (c:\Users\rikki\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:106:13195)
	at Socket.emit (events.js:315:20)
	at addChunk (internal/streams/readable.js:309:12)
	at readableAddChunk (internal/streams/readable.js:284:9)
	at Socket.Readable.push (internal/streams/readable.js:223:10)
	at Pipe.onStreamRead (internal/stream_base_commons.js:188:23)
onDidChangeNotification @ workbench.desktop.main.js:735