From 56afbe6eb15a3819460cf41c367567dd2bae9ab8 Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Wed, 20 Jul 2022 20:49:07 +0100
Subject: [PATCH] Fix crash on screen share

Don't try to wire up audio nodes if the stream has no audio track,
'cos it'll crash.

Fixes https://github.com/vector-im/element-call/issues/421
---
 src/video-grid/useMediaStream.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/video-grid/useMediaStream.ts b/src/video-grid/useMediaStream.ts
index 79e8292..5fbf57d 100644
--- a/src/video-grid/useMediaStream.ts
+++ b/src/video-grid/useMediaStream.ts
@@ -202,7 +202,12 @@ export const useSpatialMediaStream = (
   const sourceRef = useRef<MediaStreamAudioSourceNode>();
 
   useEffect(() => {
-    if (spatialAudio && tileRef.current && !mute) {
+    if (
+      spatialAudio &&
+      tileRef.current &&
+      !mute &&
+      stream.getAudioTracks().length > 0
+    ) {
       if (!pannerNodeRef.current) {
         pannerNodeRef.current = new PannerNode(audioContext, {
           panningModel: "HRTF",