src/java.desktop/macosx/classes/sun/lwawt/LWToolkit.java

*** 397,406 ****
--- 397,410 ----
  
      @Override
      public final PrintJob getPrintJob(Frame frame, String doctitle,
                                        JobAttributes jobAttributes,
                                        PageAttributes pageAttributes) {
+         if (frame == null) {
+             throw new NullPointerException("frame must not be null");
+         }
+         
          if (GraphicsEnvironment.isHeadless()) {
              throw new IllegalArgumentException();
          }
  
          PrintJob2D printJob = new PrintJob2D(frame, doctitle, jobAttributes, pageAttributes);