diff --git a/web/src/components/player/MsePlayer.tsx b/web/src/components/player/MsePlayer.tsx
index 2b9a8d4fb..80844e749 100644
--- a/web/src/components/player/MsePlayer.tsx
+++ b/web/src/components/player/MsePlayer.tsx
@@ -330,7 +330,7 @@ function MSEPlayer({
             setTimeout(() => {
               if (
                 document.visibilityState === "visible" &&
-                wsRef.current != undefined
+                wsRef.current != null
               ) {
                 onError("stalled");
               }