From 91d22e3d84fa6f8ed0c25006d7447f3306b9820d Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Thu, 28 Sep 2017 21:23:27 -0400
Subject: [PATCH] Add null check before cursor is drawn

---
 src/renderer/CursorRenderLayer.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/renderer/CursorRenderLayer.ts b/src/renderer/CursorRenderLayer.ts
index e57c326d..689d6914 100644
--- a/src/renderer/CursorRenderLayer.ts
+++ b/src/renderer/CursorRenderLayer.ts
@@ -131,6 +131,9 @@ export class CursorRenderLayer extends BaseRenderLayer {
     }
 
     const charData = terminal.buffer.lines.get(cursorY)[terminal.buffer.x];
+    if (!charData) {
+      return;
+    }
 
     if (!terminal.isFocused) {
       this._clearCursor();