#fixed code
                                private void startAppiumDriverInstance(Optional<DesiredCapabilities> iosCaps,
                                           Optional<DesiredCapabilities> androidCaps)
            throws Exception {
        AppiumDriver<MobileElement> currentDriverSession;
        if (System.getProperty("os.name").toLowerCase().contains("mac")
                && System.getenv("Platform").equalsIgnoreCase("iOS")
                || System.getenv("Platform").equalsIgnoreCase("Both")) {
            if (AppiumDeviceManager.getMobilePlatform().equals(MobilePlatform.IOS)) {
                currentDriverSession = getMobileiOSElementAppiumDriver(iosCaps);
                AppiumDriverManager.setDriver(currentDriverSession);
            } else if (AppiumDeviceManager.getMobilePlatform().equals(MobilePlatform.ANDROID)) {
                currentDriverSession = getMobileAndroidElementAppiumDriver(androidCaps);
                AppiumDriverManager.setDriver(currentDriverSession);
            }
        } else {
            currentDriverSession = getMobileAndroidElementAppiumDriver(androidCaps);
            AppiumDriverManager.setDriver(currentDriverSession);
        }
    }
#vulnerable code 
                                private void startAppiumDriverInstance(Optional<DesiredCapabilities> iosCaps,
                                           Optional<DesiredCapabilities> androidCaps)
            throws Exception {
        AppiumDriver<MobileElement> currentDriverSession;
        if (System.getProperty("os.name").toLowerCase().contains("mac")
                && System.getProperty("Platform").equalsIgnoreCase("iOS")
                || System.getProperty("Platform").equalsIgnoreCase("Both")) {
            if (AppiumDeviceManager.getMobilePlatform().equals(MobilePlatform.IOS)) {
                currentDriverSession = getMobileiOSElementAppiumDriver(iosCaps);
                AppiumDriverManager.setDriver(currentDriverSession);
            } else if (AppiumDeviceManager.getMobilePlatform().equals(MobilePlatform.ANDROID)) {
                currentDriverSession = getMobileAndroidElementAppiumDriver(androidCaps);
                AppiumDriverManager.setDriver(currentDriverSession);
            }
        } else {
            currentDriverSession = getMobileAndroidElementAppiumDriver(androidCaps);
            AppiumDriverManager.setDriver(currentDriverSession);
        }
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE