#vulnerable code 
                                public void cacheInterceptor(String cacheName, Long timeToLive, List<String> headers, List<String> queryParams) {

        Helper helper = new HelperImpl();

        RedissonClient redisson = (RedissonClient) BeanManager.getBean(RedissonClient.class);

        RequestContext context = RequestContext.getCurrentContext();

        if (shouldCache(context, headers, queryParams)) {
            RBucket<ApiResponse> rBucket = redisson.getBucket(createCacheKey(context, cacheName, headers, queryParams));

            if (rBucket.get() == null) {
                context.put(CACHE_BUCKET, rBucket);
                context.put(CACHE_TIME_TO_LIVE, timeToLive);
            } else {
                ApiResponse response = rBucket.get();

                helper.call().response().header().addAll(response.getHeaders());
                helper.call().response().setBody(response.getBody());
                helper.call().response().setStatus(response.getStatus());
            }
        }
    } 
                            #location 18 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void cacheInterceptor(String cacheName, Long timeToLive, List<String> headers, List<String> queryParams) {

        RedissonClient redisson = (RedissonClient) BeanManager.getBean(RedissonClient.class);

        RequestContext context = RequestContext.getCurrentContext();

        if (shouldCache(context, headers, queryParams)) {
            RBucket<ApiResponse> rBucket = redisson.getBucket(createCacheKey(context, cacheName, headers, queryParams));

            if (rBucket.get() == null) {
                context.put(CACHE_BUCKET, rBucket);
                context.put(CACHE_TIME_TO_LIVE, timeToLive);
            } else {
                ApiResponse response = rBucket.get();

                helper.call().response().header().addAll(response.getHeaders());
                helper.call().response().setBody(response.getBody());
                helper.call().response().setStatus(response.getStatus());
            }
        }
    }