From 7b2be12587ba95d838c006078e5d71cb8dd0f1a4 Mon Sep 17 00:00:00 2001
From: Marc-Andre Ferland <madrang@gmail.com>
Date: Sat, 10 Dec 2022 18:26:48 -0500
Subject: [PATCH] Check if window is defined. Not all JS execution environments
 have it.

---
 ui/media/js/engine.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui/media/js/engine.js b/ui/media/js/engine.js
index dd34ddb1..32b609d0 100644
--- a/ui/media/js/engine.js
+++ b/ui/media/js/engine.js
@@ -1081,7 +1081,7 @@
 
     function getServerCapacity() {
         let activeDevicesCount = Object.keys(serverState?.devices?.active || {}).length
-        if (window.document.visibilityState === 'hidden') {
+        if (typeof window === "object" && window.document.visibilityState === 'hidden') {
             activeDevicesCount = 1 + activeDevicesCount
         }
         return activeDevicesCount