--- old/modules/graphics/src/main/java/com/sun/glass/ui/Window.java	2018-10-17 23:32:27.882328502 +0530
+++ new/modules/graphics/src/main/java/com/sun/glass/ui/Window.java	2018-10-17 23:32:27.734254502 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -295,6 +295,9 @@
         if (this.ptr == 0L) {
             throw new RuntimeException("could not create platform window");
         }
+        if (screen == null) {
+            screen = Screen.getMainScreen(); // start with a default
+        }
     }
 
     public boolean isClosed() {