#fixed code
                                public HmilyParticipant preTryParticipant(final HmilyTransactionContext context, final ProceedingJoinPoint point) {
        LogUtil.debug(LOGGER, "participant hmily tcc transaction start..：{}", context::toString);
        final HmilyParticipant hmilyParticipant = buildHmilyParticipant(point, context.getParticipantId(), context.getParticipantRefId(), HmilyRoleEnum.PARTICIPANT.getCode(), context.getTransId());
        HmilyTransactionHolder.getInstance().cacheHmilyParticipant(hmilyParticipant);
        HmilyRepositoryStorage.createHmilyParticipant(hmilyParticipant);
        //publishEvent
        //Nested transaction support
        context.setRole(HmilyRoleEnum.PARTICIPANT.getCode());
        HmilyContextHolder.set(context);
        return hmilyParticipant;
    }
#vulnerable code 
                                public HmilyParticipant preTryParticipant(final HmilyTransactionContext context, final ProceedingJoinPoint point) {
        LogUtil.debug(LOGGER, "participant hmily tcc transaction start..：{}", context::toString);
        final HmilyParticipant hmilyParticipant = buildHmilyParticipant(point, context.getParticipantId(), context.getParticipantRefId(), HmilyRoleEnum.PARTICIPANT.getCode(), context.getTransId());
        //cache by guava
        if (Objects.nonNull(hmilyParticipant)) {
            HmilyParticipantCacheManager.getInstance().cacheHmilyParticipant(hmilyParticipant);
            PUBLISHER.publishEvent(hmilyParticipant, EventTypeEnum.CREATE_HMILY_PARTICIPANT.getCode());
        }
        //publishEvent
        //Nested transaction support
        context.setRole(HmilyRoleEnum.PARTICIPANT.getCode());
        HmilyContextHolder.set(context);
        return hmilyParticipant;
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE