From 13d46476c896c7794deacd89f4d012c5ae25ddce Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Thu, 28 Sep 2017 14:52:56 -0400
Subject: [PATCH] Add null check when fetching line string

See Microsoft/vscode#34466
---
 src/Buffer.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Buffer.ts b/src/Buffer.ts
index 2d23980d..548fba71 100644
--- a/src/Buffer.ts
+++ b/src/Buffer.ts
@@ -211,6 +211,9 @@ export class Buffer implements IBuffer {
     let widthAdjustedStartCol = startCol;
     let widthAdjustedEndCol = endCol;
     const line = this.lines.get(lineIndex);
+    if (!line) {
+      return '';
+    }
     for (let i = 0; i < line.length; i++) {
       const char = line[i];
       lineString += char[CHAR_DATA_CHAR_INDEX];