#fixed code
                                @PreDestroy
    public void destroy() {
        boolean isOsWindows = isOsWindows();
        if (isOsWindows) {
            logger.debug("Initiating removal of windows tray icon (if it exists)");
            try {
                WindowsTrayIcon.remove();
            } catch (Throwable e) {
                //An exception might be thrown while shutting down, ignore this
            }
        }
        logger.info("Shutting down");
    }
#vulnerable code 
                                @PreDestroy
    public void destroy() {
        String osName = System.getProperty("os.name");
        boolean isOsWindows = osName.toLowerCase().contains("windows");
        if (isOsWindows) {
            logger.debug("Initiating removal of windows tray icon (if it exists)");
            try {
                WindowsTrayIcon.remove();
            } catch (Throwable e) {
                //An exception might be thrown while shutting down, ignore this
            }
        }
        logger.info("Shutting down");
    } 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE