diff --git a/dk-modules/business/src/main/java/org/dromara/business/service/impl/BusinessAlertServiceImpl.java b/dk-modules/business/src/main/java/org/dromara/business/service/impl/BusinessAlertServiceImpl.java
index cc078b8..3f05263 100644
--- a/dk-modules/business/src/main/java/org/dromara/business/service/impl/BusinessAlertServiceImpl.java
+++ b/dk-modules/business/src/main/java/org/dromara/business/service/impl/BusinessAlertServiceImpl.java
@@ -853,7 +853,7 @@ public class BusinessAlertServiceImpl implements IBusinessAlertService {
         alertList.parallelStream().forEach(businessAlert->{
             try {
 
-                if (ObjectUtil.isNotEmpty(userIdMap.get(Long.valueOf(businessAlert.getAssignUserId())))){
+                if (ObjectUtil.isNotEmpty(businessAlert.getAssignUserId()) && ObjectUtil.isNotEmpty(userIdMap.get(Long.valueOf(businessAlert.getAssignUserId())))){
                     businessAlert.setAssignUserName(userIdMap.get(Long.valueOf(businessAlert.getAssignUserId())).get(0).getNickName());
                 }