Debug Failure. False expression: Expected position undefined to be a number.

[sheetalkamat]

TypeScript Version: 3.7.x-dev.201xxxxx as well as master

Search Terms:

Code
Open vscode in vscode sources
Open file vscode/src/vs/editor/contrib/codeAction/codeActionUi.ts

Expected behavior:
Reports errors correctly
Actual behavior:
found assert hit when getting errors

Info 2324 [11:45:23.674] request:
    {"seq":20,"type":"request","command":"geterr","arguments":{"delay":0,"files":["c:/github/vscode/src/vs/editor/contrib/codeAction/codeActionUi.ts"]}}
Perf 2325 [11:45:23.675] 20::geterr: async elapsed time (in milliseconds) 0.6946
Info 2326 [11:45:23.676] event:
    {"seq":0,"type":"event","event":"syntaxDiag","body":{"file":"c:/github/vscode/src/vs/editor/contrib/codeAction/codeActionUi.ts","diagnostics":[]}}
Err 2327  [11:45:23.679] Exception on executing command semanticDiag:

    Debug Failure. False expression: Expected position undefined to be a number.

    Error: Debug Failure. False expression: Expected position undefined to be a number.
        at failIfInvalidPosition (c:\Typescript\built\local\tsserver.js:139735:22)
        at ScriptInfo.positionToLineOffset (c:\Typescript\built\local\tsserver.js:139712:17)
        at formatDiag (c:\Typescript\built\local\tsserver.js:144692:35)
        at c:\Typescript\built\local\tsserver.js:145651:100
        at Array.map (<anonymous>)
        at IOSession.Session.sendDiagnosticsEvent (c:\Typescript\built\local\tsserver.js:145651:71)
        at IOSession.Session.semanticCheck (c:\Typescript\built\local\tsserver.js:145641:22)
        at c:\Typescript\built\local\tsserver.js:145696:31
        at MultistepOperation.executeAction (c:\Typescript\built\local\tsserver.js:144803:25)
        at c:\Typescript\built\local\tsserver.js:144784:100
        at IOSession.Session.executeWithRequestId (c:\Typescript\built\local\tsserver.js:146847:28)
        at Object.executeWithRequestId (c:\Typescript\built\local\tsserver.js:145436:87)
        at Immediate._onImmediate (c:\Typescript\built\local\tsserver.js:144784:41)
        at processImmediate (internal/timers.js:439:21)