diff --git a/yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/service/user/AdminUserServiceImpl.java b/yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/service/user/AdminUserServiceImpl.java
index dbfc02ed3..ce946f61c 100644
--- a/yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/service/user/AdminUserServiceImpl.java
+++ b/yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/service/user/AdminUserServiceImpl.java
@@ -118,6 +118,9 @@ public class AdminUserServiceImpl implements AdminUserService {
         Set<Long> dbPostIds = convertSet(userPostMapper.selectListByUserId(userId), UserPostDO::getPostId);
         // 计算新增和删除的岗位编号
         Set<Long> postIds = updateObj.getPostIds();
+        if (postIds==null) {
+            postIds = new LinkedHashSet<>();
+        }
         Collection<Long> createPostIds = CollUtil.subtract(postIds, dbPostIds);
         Collection<Long> deletePostIds = CollUtil.subtract(dbPostIds, postIds);
         // 执行新增和删除。对于已经授权的菜单，不用做任何处理