From f36ba01460c568ffa73c03354b9dd7334eb3ee7a Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Thu, 5 Oct 2017 11:15:46 -0700
Subject: [PATCH] Add a null check to areSelectionValuesReversed

See Microsoft/vscode#35601
---
 src/SelectionModel.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/SelectionModel.ts b/src/SelectionModel.ts
index 1fbf40fe..5982b1e9 100644
--- a/src/SelectionModel.ts
+++ b/src/SelectionModel.ts
@@ -97,6 +97,9 @@ export class SelectionModel {
   public areSelectionValuesReversed(): boolean {
     const start = this.selectionStart;
     const end = this.selectionEnd;
+    if (!start || !end) {
+      return false;
+    }
     return start[1] > end[1] || (start[1] === end[1] && start[0] > end[0]);
   }