#fixed code
                                @RequestMapping(value = "/rest/statuses/{statusId}",
            method = RequestMethod.PATCH)
    @ResponseBody
    public StatusDTO updateStatusV3(@RequestBody ActionStatus action, @PathVariable("statusId") String statusId) {
        try {
            StatusDTO status = timelineService.getStatus(statusId);
            if(action.isFavorite() != null && status.isFavorite() != action.isFavorite()){
                if(action.isFavorite()){
                    timelineService.addFavoriteStatus(statusId);
                }
                else {
                    timelineService.removeFavoriteStatus(statusId);
                }
                status.setFavorite(action.isFavorite());
            }
            if(action.isShared() != null && action.isShared()){
                timelineService.shareStatus(statusId);
            }
            if(action.isAnnounced() != null && action.isAnnounced()){
                timelineService.announceStatus(statusId);
            }
            return status;
        } catch (Exception e) {
            if (log.isDebugEnabled()) {
                e.printStackTrace();
            }
            return null;
        }
    }
#vulnerable code 
                                @RequestMapping(value = "/rest/statuses/{statusId}",
            method = RequestMethod.PATCH)
    @ResponseBody
    public StatusDTO updateStatusV3(@RequestBody ActionStatus action, @PathVariable("statusId") String statusId) {
        try {
            StatusDTO status = timelineService.getStatus(statusId);
            if(action.isFavorite() != null && status.isFavorite() != action.isFavorite()){
                if(action.isFavorite()){
                    timelineService.addFavoriteStatus(statusId);
                }
                else {
                    timelineService.removeFavoriteStatus(statusId);
                }
                status.setFavorite(action.isFavorite());
            }
            if(action.isShared() != null && action.isShared()){
                timelineService.shareStatus(statusId);
            }
            return status;
        } catch (Exception e) {
            if (log.isDebugEnabled()) {
                e.printStackTrace();
            }
            return null;
        }
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE