From 98d25607a9ca9ce499540e3c34ee819e0ea2480a Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Tue, 26 Dec 2017 02:22:09 -0800
Subject: [PATCH] Prevent exception when setting bellSound before open

Fixes #1165
---
 src/Terminal.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Terminal.ts b/src/Terminal.ts
index b685c8cd..ce683912 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -2116,6 +2116,11 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
   }
 
   private syncBellSound(): void {
+    // Don't update anything if the terminal has not been opened yet
+    if (!this.element) {
+      return;
+    }
+
     if (this.soundBell() && this.bellAudioElement) {
       this.bellAudioElement.setAttribute('src', this.options.bellSound);
     } else if (this.soundBell()) {