From 688b96f7dfa37b53b88eec4e6cb9af75a499fe86 Mon Sep 17 00:00:00 2001
From: Johannes Rieken <johannes.rieken@gmail.com>
Date: Fri, 5 May 2017 14:54:10 +0200
Subject: [PATCH] fix #26021

---
 src/vs/base/browser/dom.ts | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/vs/base/browser/dom.ts b/src/vs/base/browser/dom.ts
index b2ec45dbb77c5..21698e938db4a 100644
--- a/src/vs/base/browser/dom.ts
+++ b/src/vs/base/browser/dom.ts
@@ -160,19 +160,25 @@ const _manualClassList = new class {
 
 const _nativeClassList = new class {
 	hasClass(node: HTMLElement, className: string): boolean {
-		return className && node.classList.contains(className);
+		return className && node.classList && node.classList.contains(className);
 	}
 
 	addClass(node: HTMLElement, className: string): void {
-		return className && node.classList.add(className);
+		if (className && node.classList) {
+			node.classList.add(className);
+		}
 	}
 
 	removeClass(node: HTMLElement, className: string): void {
-		return className && node.classList.remove(className);
+		if (className && node.classList) {
+			node.classList.remove(className);
+		}
 	}
 
 	toggleClass(node: HTMLElement, className: string, shouldHaveIt?: boolean): void {
-		node.classList.toggle(className, shouldHaveIt);
+		if (node.classList) {
+			node.classList.toggle(className, shouldHaveIt);
+		}
 	}
 };