获取用户是否参加活动

xx-activity/xx-activity-server/src/main/java/com/xxfc/platform/activity/biz/ActivityPopularizeBiz.java

@@ -99,7 +99,7 @@ public class ActivityPopularizeBiz extends BaseBiz<ActivityPopularizeMapper,Acti
                     //新增第几个邀请人和邀请金额字段
                     Integer num = relationBiz.getByUserIdAndPopularizeId(activityPopularizeRelation);
 
-                    BigDecimal amount = null;
+                    BigDecimal amount = new BigDecimal(0);
                     JSONObject jsonObject = JSONObject.parseObject(activityPopularizeItem.getDetail());
                     if (jsonObject != null && StringUtils.isNotBlank(jsonObject.getString("detail"))) {
                         JSONArray jsonArray = JSONArray.parseArray(jsonObject.getString("detail"));