--- old/src/java.desktop/macosx/classes/com/apple/laf/AquaMenuBarUI.java	2017-04-13 21:21:54.000000000 +0300
+++ new/src/java.desktop/macosx/classes/com/apple/laf/AquaMenuBarUI.java	2017-04-13 21:21:54.000000000 +0300
@@ -50,7 +50,7 @@
     public void uninstallUI(final JComponent c) {
         if (fScreenMenuBar != null) {
             final JFrame frame = (JFrame)(c.getTopLevelAncestor());
-            if (frame.getMenuBar() == fScreenMenuBar) {
+            if (frame != null && frame.getMenuBar() == fScreenMenuBar) {
                 frame.setMenuBar((MenuBar)null);
             }
             fScreenMenuBar = null;