From 1eddd56320e5eb72e302fb06d4fdeeb3e7e856a7 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Tue, 13 Feb 2018 15:24:08 -0800
Subject: [PATCH] Fix the assert for undefined leaf in LineNode Fixes #21818

---
 src/server/scriptVersionCache.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/server/scriptVersionCache.ts b/src/server/scriptVersionCache.ts
index dccf4d3267b19..fa4445bfc4fa5 100644
--- a/src/server/scriptVersionCache.ts
+++ b/src/server/scriptVersionCache.ts
@@ -680,7 +680,7 @@ namespace ts.server {
 
             // Skipped all children
             const { leaf } = this.lineNumberToInfo(this.lineCount(), 0);
-            return { oneBasedLine: this.lineCount(), zeroBasedColumn: leaf.charCount(), lineText: undefined };
+            return { oneBasedLine: this.lineCount(), zeroBasedColumn: leaf ? leaf.charCount() : 0, lineText: undefined };
         }
 
         /**