fix

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

@@ -88,7 +88,7 @@ public class ActivityRecommendServiceImpl extends ServiceImpl<ActivityRecommendM
         validEntityBeforeSave(add);
         add.setCreateTime(DateUtils.getNowTime());
         add.setUpdateTime(DateUtils.getNowTime());
-        if (CollectionUtils.isNotEmpty(bo.getSubjectIds())){
+        if (CollectionUtils.isNotEmpty(bo.getSubjectIds())&&bo.getSubjectIds().size()>0){
             add.setSubjectIds(StringUtils.join(bo.getSubjectIds(),","));
         }
         Boolean rs =  this.save(add);