#fixed code
                              @Override
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    String mName = method.getName();
    if ("handleAbout".equals(mName)) {
      sikulixIDE.doAbout();
    } else if ("handlePreferences".equals(mName)) {
      sikulixIDE.showPreferencesWindow();
    } else if ("handleQuitRequestWith".equals(mName)) {
      try {
        Class sysclass = URLClassLoader.class;
        Class comAppleEawtQuitResponse = sysclass.forName("com.apple.eawt.QuitResponse");
        Method mCancelQuit = comAppleEawtQuitResponse.getMethod("cancelQuit", null);
        Method mPerformQuit = comAppleEawtQuitResponse.getMethod("performQuit", null);
        Object resp = args[1];
        if (!sikulixIDE.quit()) {
          mCancelQuit.invoke(resp, null);
        } else {
          mPerformQuit.invoke(resp, null);
        }
      } catch (Exception ex) {
        log(lvl, "NativeSupport: Quit: error: %s", ex.getMessage());
        System.exit(1);
      }
    }
    return new Object();
  }
#vulnerable code 
                              @Override
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    String mName = method.getName();
    if ("handleAbout".equals(mName)) {
      SikuliIDE.getInstance().doAbout();
    } else if ("handlePreferences".equals(mName)) {
      SikuliIDE.getInstance().showPreferencesWindow();
    } else if ("handleQuitRequestWith".equals(mName)) {
      try {
        Class sysclass = URLClassLoader.class;
        Class comAppleEawtQuitResponse = sysclass.forName("com.apple.eawt.QuitResponse");
        Method mCancelQuit = comAppleEawtQuitResponse.getMethod("cancelQuit", null);
        Method mPerformQuit = comAppleEawtQuitResponse.getMethod("performQuit", null);
        Object resp = args[1];
        if (!SikuliIDE.getInstance().quit()) {
          mCancelQuit.invoke(resp, null);
        } else {
          mPerformQuit.invoke(resp, null);
        }
      } catch (Exception ex) {
        log(lvl, "NativeSupport: Quit: error: %s", ex.getMessage());
        System.exit(1);
      }
    }
    return new Object();
  } 
                            #location 15 
                            #vulnerability type THREAD_SAFETY_VIOLATION