TypeError: Cannot read property 'escapedName' of undefined in symbolName during getOccurences

[aozgaa]

tsserver version: 2.6.1
hits: 37972

stack:

TypeError: Cannot read property 'escapedName' of undefined
    at symbolName (tsserver.js:67404:23)
    at getImport (tsserver.js:67344:36)
    at Object.getImportOrExportSymbol (tsserver.js:67271:68)
    at getImportOrExportReferences (tsserver.js:68097:56)
    at getReferencesAtLocation (tsserver.js:68045:17)
    at getReferencesInContainer (tsserver.js:68007:21)
    at getReferencedSymbolsForSymbol (tsserver.js:67748:25)
    at Object.getReferencedSymbolsForNode (tsserver.js:67664:24)
    at Object.getReferenceEntriesForNode (tsserver.js:67502:58)
    at getSemanticDocumentHighlights (tsserver.js:66388:57)
    at Object.getDocumentHighlights (tsserver.js:66377:20)
    at getDocumentHighlights (tsserver.js:79870:42)
    at getOccurrencesAtPositionCore (tsserver.js:79873:46)
    at Object.getOccurrencesAtPosition (tsserver.js:79859:27)
    at IOSession.Session.getOccurrences (tsserver.js:85781:64)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (tsserver.js:85403:61)
    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.

[ghost]

Duplicate of #21792