--- a/jdk/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	Mon Jun 01 13:40:43 2015 +0300
+++ b/jdk/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	Mon Jun 01 17:46:28 2015 +0400
@@ -985,11 +985,13 @@
     }
 
     private void checkZoom() {
-        int state = peer.getState();
-        if (state != Frame.MAXIMIZED_BOTH && isMaximized()) {
-            deliverZoom(true);
-        } else if (state == Frame.MAXIMIZED_BOTH && !isMaximized()) {
-            deliverZoom(false);
+        if (peer != null) {
+            int state = peer.getState();
+            if (state != Frame.MAXIMIZED_BOTH && isMaximized()) {
+                deliverZoom(true);
+            } else if (state == Frame.MAXIMIZED_BOTH && !isMaximized()) {
+                deliverZoom(false);
+            }
         }
     }