Fix this

Assets/Scripts/DiscordRPCHandler.cs

@@ -28,12 +28,12 @@ public class DiscordRPCHandler : MonoBehaviour
 
     void OnDestroy()
     {
-        client.Dispose();
+        client?.Dispose();
     }
 
     void OnApplicationQuit()
     {
-        client.Dispose();
+        client?.Dispose();
     }
 
     void OnApplicationPause(bool pause)