From 5e70adb5110f731a4c8e17ecaad116aad9bb18b7 Mon Sep 17 00:00:00 2001
From: Kevin Sawicki <kevinsawicki@gmail.com>
Date: Mon, 13 Mar 2017 11:22:08 -0700
Subject: [PATCH] Guard against only specifying select or highlight handler

---
 lib/browser/api/touch-bar.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/browser/api/touch-bar.js b/lib/browser/api/touch-bar.js
index 7f997edde87c..62b3e2195b58 100644
--- a/lib/browser/api/touch-bar.js
+++ b/lib/browser/api/touch-bar.js
@@ -235,11 +235,14 @@ TouchBar.TouchBarScrubber = class TouchBarScrubber extends TouchBarItem {
   constructor (config) {
     super()
     if (config == null) config = {}
-    const {items, onSelect, onHighlight} = config
+    const {items} = config
+    let {onSelect, onHighlight} = config
     this.type = 'scrubber'
     this._addLiveProperty('items', items)
 
     if (typeof onSelect === 'function' || typeof onHighlight === 'function') {
+      if (onSelect == null) onSelect = () => {}
+      if (onHighlight == null) onHighlight = () => {}
       this.onInteraction = (details) => {
         if (details.type === 'select') {
           onSelect(details.selectedIndex)