output: #fixed code
                               @Test
  	public void testCache() throws Exception {
  		BrowserManager browserManager = WebDriverManager
  				.getInstance(driverClass);
  		browserManager.architecture(architecture).version(driverVersion)
  				.setup();
  		Downloader downloader = new Downloader(browserManager);
  
  		Method method = BrowserManager.class.getDeclaredMethod(
  				"existsDriverInCache", String.class, String.class,
  				Architecture.class);
  		method.setAccessible(true);
  		String driverInChachePath = (String) method.invoke(browserManager,
  				downloader.getTargetPath(), driverVersion, architecture);
  
  		assertThat(driverInChachePath, notNullValue());
  	}
input: #vulnerable code 
                               @Test
  	public void testCache() throws Exception {
  		BrowserManager browserManager = null;
  		if (browserManagerClass.equals(ChromeDriverManager.class)) {
  			browserManager = ChromeDriverManager.getInstance();
  		} else if (browserManagerClass.equals(OperaDriverManager.class)) {
  			browserManager = OperaDriverManager.getInstance();
  		} else if (browserManagerClass.equals(PhantomJsDriverManager.class)) {
  			browserManager = PhantomJsDriverManager.getInstance();
  		} else if (browserManagerClass.equals(FirefoxDriverManager.class)) {
  			browserManager = FirefoxDriverManager.getInstance();
  		}
  
  		browserManager.architecture(architecture).version(driverVersion)
  				.setup();
  		Downloader downloader = new Downloader(browserManager);
  
  		Method method = BrowserManager.class.getDeclaredMethod(
  				"existsDriverInCache", String.class, String.class,
  				Architecture.class);
  		method.setAccessible(true);
  		String driverInChachePath = (String) method.invoke(browserManager,
  				downloader.getTargetPath(), driverVersion, architecture);
  
  		assertThat(driverInChachePath, notNullValue());
  	} 
                              #location 14 
                              #vulnerability type NULL_DEREFERENCE