--- old/src/share/classes/sun/awt/image/VolatileSurfaceManager.java	2012-09-04 13:37:25.000000000 +0400
+++ new/src/share/classes/sun/awt/image/VolatileSurfaceManager.java	2012-09-04 13:37:24.000000000 +0400
@@ -335,9 +335,12 @@
             sdBackup = null;
             sdCurrent = getBackupSurface();
             // Now, invalidate the old hardware-based SurfaceData
-            SurfaceData oldData = sdAccel;
-            sdAccel = null;
-            oldData.invalidate();
+            // Note that getBackupSurface may set sdAccel to null!!
+            if (sdAccel != null) {
+                SurfaceData oldData = sdAccel;
+                sdAccel = null;
+                oldData.invalidate();
+            }
         }
         // Update graphicsConfig for the vImg in case it changed due to
         // this display change event