#vulnerable code 
                                @Override
    public void init() {
        try {
            NetworkContext.setNetworkConfig(ConfigLoader.loadProperties(NetworkConstant.NETWORK_PROPERTIES));
        } catch (IOException e) {
            Log.error(e);
            throw new NulsRuntimeException(ErrorCode.IO_ERROR);
        }
        this.registerService(NetworkServiceImpl.class);
        networkService = NulsContext.getServiceBean(NetworkService.class);
        networkService.init();
        this.registerEvent();

    } 
                            #location 11 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public void init() {
        try {
            NetworkContext.setNetworkConfig(ConfigLoader.loadProperties(NetworkConstant.NETWORK_PROPERTIES));
        } catch (IOException e) {
            Log.error(e);
            throw new NulsRuntimeException(ErrorCode.IO_ERROR);
        }
        this.registerService(NetworkServiceImpl.class);
        networkService = NulsContext.getServiceBean(NetworkService.class);
        this.registerEvent();

    }