From c387fb18192e9c33dea12eaae3b7f4883a13139a Mon Sep 17 00:00:00 2001
From: Nadia Holmquist Pedersen <nadia@nhp.sh>
Date: Sat, 5 Nov 2022 16:57:28 +0100
Subject: [PATCH] mainWindow may be nullptr when audioMute() is called.

Fixes potential crash on launch when multiplayer audio output is set to only the current window.
---
 src/frontend/qt_sdl/main.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/frontend/qt_sdl/main.cpp b/src/frontend/qt_sdl/main.cpp
index e8e30a7e..7a816987 100644
--- a/src/frontend/qt_sdl/main.cpp
+++ b/src/frontend/qt_sdl/main.cpp
@@ -186,7 +186,8 @@ void audioMute()
         break;
 
     case 2: // only currently focused instance
-        if (!mainWindow->isActiveWindow()) audioMuted = true;
+        if (mainWindow != nullptr)
+            audioMuted = !mainWindow->isActiveWindow();
         break;
     }
 }