fix

zhongzheng-system/src/main/java/com/zhongzheng/modules/activity/service/impl/ActivityRecommendServiceImpl.java

@@ -126,7 +126,7 @@ public class ActivityRecommendServiceImpl extends ServiceImpl<ActivityRecommendM
         ActivityRecommend update = BeanUtil.toBean(bo, ActivityRecommend.class);
         validEntityBeforeSave(update);
         update.setUpdateTime(DateUtils.getNowTime());
-        if (CollectionUtils.isNotEmpty(bo.getSubjectIds())){
+        if (CollectionUtils.isNotEmpty(bo.getSubjectIds())&&bo.getSubjectIds().size()>0){
             update.setSubjectIds(StringUtils.join(bo.getSubjectIds(),","));
         }
         if(bo.getGoodsList()!=null){