From 16477b65067d7e4b3d71eeb1300ae03d7723fe2d Mon Sep 17 00:00:00 2001
From: christian <chrissantos1995@gmail.com>
Date: Sat, 8 Sep 2018 00:06:07 -0400
Subject: [PATCH] Take into account undefined nodeValue when recording
 diagnostic

---
 src/compiler/commandLineParser.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index ecc69fccf86..edee847019a 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -1847,8 +1847,12 @@ namespace ts {
                     const hasZeroOrNoReferences = !hasReferences || raw.references.length === 0;
                     if (filesSpecs.length === 0 && hasZeroOrNoReferences) {
                         if (sourceFile) {
+                            const fileName = configFileName || "tsconfig.json";
+                            const diagnosticMessage = Diagnostics.The_files_list_in_config_file_0_is_empty;
                             const nodeValue = firstDefined(getTsConfigPropArray(sourceFile, "files"), property => property.initializer);
-                            const error = createDiagnosticForNodeInSourceFile(sourceFile, nodeValue!, Diagnostics.The_files_list_in_config_file_0_is_empty, configFileName || "tsconfig.json");
+                            const error = nodeValue
+                                ? createDiagnosticForNodeInSourceFile(sourceFile, nodeValue, diagnosticMessage, fileName)
+                                : createCompilerDiagnostic(diagnosticMessage, fileName);
                             errors.push(error);
                         }
                         else {