From 4e9ef72b73e2ac9d79031199d262e5d15323bc8a Mon Sep 17 00:00:00 2001
From: Rob Lourens <roblourens@gmail.com>
Date: Mon, 23 Apr 2018 14:28:54 -0700
Subject: [PATCH] For #46733 - fix npe from 9ce5816

---
 src/vs/platform/list/browser/listService.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/vs/platform/list/browser/listService.ts b/src/vs/platform/list/browser/listService.ts
index f59e23ce4ce..bc246f6ed0c 100644
--- a/src/vs/platform/list/browser/listService.ts
+++ b/src/vs/platform/list/browser/listService.ts
@@ -480,7 +480,8 @@ export class TreeResourceNavigator extends Disposable {
 		const isMouseEvent = payload && payload.origin === 'mouse';
 		const isDoubleClick = isMouseEvent && originalEvent && originalEvent.detail === 2;
 
-		if (!payload.preventOpenOnFocus && (!isMouseEvent || this.tree.openOnSingleClick || isDoubleClick)) {
+		const preventOpen = payload && payload.preventOpenOnFocus;
+		if (!preventOpen && (!isMouseEvent || this.tree.openOnSingleClick || isDoubleClick)) {
 			this._openResource.fire({
 				editorOptions: {
 					preserveFocus: true,