#fixed code
                                private static String getAddress() {
        if (LOCAL_ADDRESS != null) {
            return LOCAL_ADDRESS;
        }
        InetAddress localAddress = getFirstValidAddress();
        LOCAL_ADDRESS = localAddress != null ? localAddress.getHostAddress() : null;
        return LOCAL_ADDRESS;
    }
#vulnerable code 
                                private static String getAddress() {
        if (LOCAL_ADDRESS != null) {
            return LOCAL_ADDRESS;
        }
        InetAddress localAddress = getFirstValidAddress();
        LOCAL_ADDRESS = localAddress.getHostAddress();
        return LOCAL_ADDRESS;
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE