diff --git a/src/showplanner/Player.tsx b/src/showplanner/Player.tsx
index b1897aa..ff5d1a5 100644
--- a/src/showplanner/Player.tsx
+++ b/src/showplanner/Player.tsx
@@ -78,7 +78,7 @@ export function Player({ id }: { id: number }) {
       case 2:
         return "player-2";
       default:
-        return "master";
+        throw new Error("Unknown Player VUMeter source: " + id);
     }
   };
   return (