src/share/classes/sun/awt/image/VolatileSurfaceManager.java

*** 333,346 ****
--- 333,349 ----
              // using a SurfaceData that was created in a different
              // display mode.
              sdBackup = null;
              sdCurrent = getBackupSurface();
              // Now, invalidate the old hardware-based SurfaceData
+             // 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
          vImg.updateGraphicsConfig();
      }