From ecddf8468fae73208126f2bc5aba4c39ef1e0875 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Fri, 16 Feb 2018 16:37:32 -0800
Subject: [PATCH] Fix the assert for undefined leaf in LineNode (#21924)

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 dccf4d3267b..fa4445bfc4f 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 };
         }
 
         /**