TS Server fatal error: Cannot read property 'length' of undefined

[barry-oneil]

TypeScript Version: 3.8.3
Steps to reproduce crash
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TS Server Error Stack

TypeError: Cannot read property 'length' of undefined
    at createSourceFile (tsserver.js:19148:110)
    at Object.parseJsonText (tsserver.js:18972:26)
    at Object.parseJsonText (tsserver.js:18793:23)
    at ProjectService.loadConfiguredProject (tsserver.js:142258:33)
    at ProjectService.createAndLoadConfiguredProject (tsserver.js:142240:22)
    at ProjectService.createLoadAndUpdateConfiguredProject (tsserver.js:142245:36)
    at ProjectService.assignProjectToOpenedScriptInfo (tsserver.js:143101:44)
    at tsserver.js:143396:107
    at Object.mapDefined (tsserver.js:562:30)
    at ProjectService.applyChangesInOpenFiles (tsserver.js:143396:48)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:144260:46)
    at tsserver.js:146003:88
    at IOSession.Session.executeWithRequestId (tsserver.js:145994:28)
    at IOSession.Session.executeCommand (tsserver.js:146003:33)
    at IOSession.Session.onMessage (tsserver.js:146027:35)
    at Interface.<anonymous> (tsserver.js:147342:27)
    at Interface.emit (events.js:200:13)
    at Interface._onLine (readline.js:314:10)
    at Interface._normalWrite (readline.js:459:12)
    at Socket.ondata (readline.js:170:10)
    at Socket.emit (events.js:200:13)
    at addChunk (_stream_readable.js:294:12)
    at readableAddChunk (_stream_readable.js:275:11)
    at Socket.Readable.push (_stream_readable.js:210:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:166:17)

[mjbvz]

Looks like the same stack as #36862

@barry-oneil What operating system are you using?

[barry-oneil]

Windows 10 Pro Insider Preview build 19582.1001

[sheetalkamat]

Duplicate stack #36862