TypeError: Cannot read property 'escapedName' of undefined in `filterObjectMembersList` during `getCompletions`

[aozgaa]

tsserver version: 2.6.1
hitting sessions: 1462
stack:

TypeError: Cannot read property 'escapedName' of undefined
    at tsserver.js:66168:107
    at Object.filter (tsserver.js:1462:31)
    at filterObjectMembersList (tsserver.js:66168:27)
    at tryGetObjectLikeCompletionSymbols (tsserver.js:65826:31)
    at tryGetGlobalSymbols (tsserver.js:65549:28)
    at getCompletionData (tsserver.js:65478:22)
    at Object.getCompletionsAtPosition (tsserver.js:65060:34)
    at Object.getCompletionsAtPosition (tsserver.js:79777:35)
    at IOSession.Session.getCompletions (tsserver.js:86199:64)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (tsserver.js:85311:61)
    at tsserver.js:86669:88
    at IOSession.Session.executeWithRequestId (tsserver.js:86660:28)
    at IOSession.Session.executeCommand (tsserver.js:86669:33)
    at IOSession.Session.onMessage (tsserver.js:86689:35)
    at Interface.<anonymous> (tsserver.js:87881:27)
    at emitOne (events.js:96:13)
    at Interface.emit (events.js:191:7)
    at Interface._onLine (readline.js:241:10)
    at Interface._normalWrite (readline.js:384:12)
    at Socket.ondata (readline.js:101:10)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:191:7)
    at readableAddChunk (_stream_readable.js:178:18)
    at Socket.Readable.push (_stream_readable.js:136:10)
    at Pipe.onread (net.js:560:20)

[mhegazy]

The Source: Telemetry have limited information. we only have the call stack from the crash report. We need to either mitigate the crash, or add additional asserts to get more information in future crash reports.