diff --git a/application/index/controller/admin/Group.php b/application/index/controller/admin/Group.php
index 07304460..0eada815 100644
--- a/application/index/controller/admin/Group.php
+++ b/application/index/controller/admin/Group.php
@@ -88,6 +88,9 @@ class Group extends Base
             Db::startTrans();
             try {
                 $id = $this->request->post('id');
+                if (1 == $id) {
+                    throw new Exception('默认组不可删除');
+                }
                 $group = GroupModel::find($id);
                 // 至少保留一个默认分组
                 $defaultId = GroupModel::where('default', 1)->where('id', 'neq', $id)->value('id');
diff --git a/update.sql b/update.sql
index 960cfd09..2b6f3a8a 100644
--- a/update.sql
+++ b/update.sql
@@ -62,7 +62,7 @@ CREATE TABLE IF NOT EXISTS `lsky_group` (
   `create_time` int(11) DEFAULT NULL COMMENT '添加时间',
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE utf8mb4_general_ci COMMENT='文件夹表';
-INSERT IGNORE INTO `lsky_group` (`id`, `strategy`, `name`, `default`, `update_time`, `create_time`) VALUES (NULL, 'local', '默认组', '1', '0', '0');
+INSERT IGNORE INTO `lsky_group` (`id`, `strategy`, `name`, `default`, `create_time`) VALUES ('1', 'local', '默认组', '1', '0');
 
 -- v1.5.1
 UPDATE `lsky_config` SET `value` = '1.5.1' WHERE `lsky_config`.`name` = 'system_version';