From 76d612faf4b40c6ae603fecaa6710bd68279e0e7 Mon Sep 17 00:00:00 2001
From: Christopher Snowhill <kode54@gmail.com>
Date: Fri, 15 Jul 2022 22:51:59 -0700
Subject: [PATCH] [Audio Output] Only unregister listener if used

Only unregister the listener if it actually has been registered, and
clear the handle upon doing so.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
---
 Audio/Output/OutputAVFoundation.m | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Audio/Output/OutputAVFoundation.m b/Audio/Output/OutputAVFoundation.m
index 9949fc37f..bf8c9a45f 100644
--- a/Audio/Output/OutputAVFoundation.m
+++ b/Audio/Output/OutputAVFoundation.m
@@ -1126,7 +1126,10 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 }
 
 - (void)removeSynchronizerBlock {
-	[renderSynchronizer removeTimeObserver:currentPtsObserver];
+	if(renderSynchronizer && currentPtsObserver) {
+		[renderSynchronizer removeTimeObserver:currentPtsObserver];
+		currentPtsObserver = nil;
+	}
 }
 
 - (void)setVolume:(double)v {