diff --git a/Assets/Scripts/Net/Net.cs b/Assets/Scripts/Net/Net.cs
index f354e50..c302d86 100644
--- a/Assets/Scripts/Net/Net.cs
+++ b/Assets/Scripts/Net/Net.cs
@@ -21,7 +21,9 @@ namespace NeonTea.Quakeball.Net {
         }
 
         public static void Quit() {
-            Singleton.Instance.Stop();
+            if (Singleton.Instance != null) {
+                Singleton.Instance.Stop();
+            }
         }
 
         [RuntimeInitializeOnLoadMethod]