#fixed code
                                public static void printScreen() {
        if (error == null || error || !error) {
            printScreenWithOld();
        } else {
            try {
                String[] args = new String[]{"bash", "-c", adbPath + " exec-out screencap -p > " + screenshotLocation};
                String os = System.getProperty("os.name");
                if (os.toLowerCase().startsWith("win")) {
                    args[0] = "cmd";
                    args[1] = "/c";
                }
                Process p1 = Runtime.getRuntime().exec(args);
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(p1.getErrorStream()));
                String s;
                while ((s = bufferedReader.readLine()) != null)
                    System.out.println(s);
                p1.waitFor();
                checkScreenSuccess();
            } catch (IOException e) {
                e.printStackTrace();
                error = true;
                printScreenWithOld();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
#vulnerable code 
                                public static void printScreen() {
        if (error != null && error) {
            printScreenWithOld();
        } else {
            try {
                String[] args = new String[]{"bash", "-c", adbPath + " exec-out screencap -p > " + screenshotLocation};
                String os = System.getProperty("os.name");
                if (os.toLowerCase().startsWith("win")) {
                    args[0] = "cmd";
                    args[1] = "/c";
                }
                Process p1 = Runtime.getRuntime().exec(args);
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(p1.getErrorStream()));
                String s;
                while ((s = bufferedReader.readLine()) != null)
                    System.out.println(s);
                p1.waitFor();
                checkScreenSuccess();
            } catch (IOException e) {
                e.printStackTrace();
                error = true;
                printScreenWithOld();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    } 
                            #location 8 
                            #vulnerability type NULL_DEREFERENCE