From e87e1767b560b6d5fb23aeb8cfcd4ac70ebfcf9b Mon Sep 17 00:00:00 2001
From: Caitlin Hennessy <caitlin.hennessy@microsoft.com>
Date: Fri, 8 Dec 2017 11:16:47 -0800
Subject: [PATCH] Null check

---
 sim/state/sounds.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sim/state/sounds.ts b/sim/state/sounds.ts
index e0c39dd4..a43aacde 100644
--- a/sim/state/sounds.ts
+++ b/sim/state/sounds.ts
@@ -22,7 +22,7 @@ namespace pxsim.SoundMethods {
     }
 
     export function play(buf: RefBuffer, volume: number) {
-        if (numSoundsPlaying >= soundsLimit) {
+        if (!buf || numSoundsPlaying >= soundsLimit) {
             return Promise.resolve();
         }
         return new Promise<void>(resolve => {