From 508366e3fc0c7ea42fe732b2d792c6bcad9a43e5 Mon Sep 17 00:00:00 2001
From: Matt Bierner <matb@microsoft.com>
Date: Tue, 20 Feb 2018 11:18:27 -0800
Subject: [PATCH] Fix null deref when activeEditor is undefined

Fixes #44009
---
 src/vs/workbench/api/electron-browser/mainThreadWebview.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vs/workbench/api/electron-browser/mainThreadWebview.ts b/src/vs/workbench/api/electron-browser/mainThreadWebview.ts
index 1d7da64f539..cf42eee83d2 100644
--- a/src/vs/workbench/api/electron-browser/mainThreadWebview.ts
+++ b/src/vs/workbench/api/electron-browser/mainThreadWebview.ts
@@ -346,7 +346,7 @@ export class MainThreadWebview implements MainThreadWebviewShape {
 	private onEditorsChanged() {
 		const activeEditor = this._editorService.getActiveEditor();
 		let newActiveWebview: WebviewInput | undefined = undefined;
-		if (activeEditor.input instanceof WebviewInput) {
+		if (activeEditor && activeEditor.input instanceof WebviewInput) {
 			for (const handle of map.keys(this._webviews)) {
 				const input = this._webviews.get(handle);
 				if (input.matches(activeEditor.input)) {