In getSuggestionForNonexistentSymbol, guard name against undefined

src/compiler/checker.ts

@@ -15064,7 +15064,10 @@ namespace ts {
 
         function getSuggestionForNonexistentSymbol(location: Node, name: __String, meaning: SymbolFlags): string {
             const result = resolveNameHelper(location, name, meaning, /*nameNotFoundMessage*/ undefined, name, /*isUse*/ false, (symbols, name, meaning) => {
-                // `name` from the callback === the outer `name`
+                // NOTE: `name` from the callback is supposed to  === the outer `name`, but is undefined in some cases
+                if (name === undefined) {
+                    return undefined;
+                }
                 const symbol = getSymbol(symbols, name, meaning);
                 // Sometimes the symbol is found when location is a return type of a function: `typeof x` and `x` is declared in the body of the function
                 // So the table *contains* `x` but `x` isn't actually in scope.