update document

xxl-job-admin/src/main/java/com/xxl/job/admin/service/impl/XxlJobServiceImpl.java

 							MessageFormat.format((I18nUtil.getString("jobinfo_field_childJobId")+"({0})"+I18nUtil.getString("system_unvalid")), childJobIdItem));
 				}
 			}
-
-			jobInfo.setChildJobId(childJobId);
 		}
 
 		// add in db
 							MessageFormat.format((I18nUtil.getString("jobinfo_field_childJobId")+"({0})"+I18nUtil.getString("system_unvalid")), childJobIdItem));
 				}
 			}
-
-			jobInfo.setChildJobId(childJobId);
 		}
 
 		// group valid
 		exists_jobInfo.setExecutorBlockStrategy(jobInfo.getExecutorBlockStrategy());
 		exists_jobInfo.setExecutorTimeout(jobInfo.getExecutorTimeout());
 		exists_jobInfo.setExecutorFailRetryCount(jobInfo.getExecutorFailRetryCount());
-		exists_jobInfo.setChildJobId(childJobId);
+		exists_jobInfo.setChildJobId(jobInfo.getChildJobId());
 		exists_jobInfo.setTriggerNextTime(nextTriggerTime);
         xxlJobInfoDao.update(exists_jobInfo);