diff --git a/README.md b/README.md
index a0d34b6..feddbbf 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 <div align="center">
   <img width="500" style="max-width:100%" src="resource/static/brand.png" title="哪吒监控">
   <br><br>
-<img src="https://img.shields.io/github/workflow/status/naiba/nezha/Dashboard%20image?label=Dash%20v0.9.0&logo=github&style=for-the-badge">&nbsp;<img src="https://img.shields.io/github/v/release/naiba/nezha?color=brightgreen&label=Agent&style=for-the-badge&logo=github">&nbsp;<img src="https://img.shields.io/github/workflow/status/naiba/nezha/Agent%20release?label=Agent%20CI&logo=github&style=for-the-badge">&nbsp;<img src="https://img.shields.io/badge/Installer-v0.6.4-brightgreen?style=for-the-badge&logo=linux">
+<img src="https://img.shields.io/github/workflow/status/naiba/nezha/Dashboard%20image?label=Dash%20v0.9.1&logo=github&style=for-the-badge">&nbsp;<img src="https://img.shields.io/github/v/release/naiba/nezha?color=brightgreen&label=Agent&style=for-the-badge&logo=github">&nbsp;<img src="https://img.shields.io/github/workflow/status/naiba/nezha/Agent%20release?label=Agent%20CI&logo=github&style=for-the-badge">&nbsp;<img src="https://img.shields.io/badge/Installer-v0.6.4-brightgreen?style=for-the-badge&logo=linux">
   <br>
   <br>
   <p>:trollface: <b>哪吒监控</b> 一站式轻监控轻运维系统。支持系统状态、HTTP(SSL 证书变更、即将到期、到期)、TCP、Ping 监控报警，命令批量执行和计划任务。</p>	
diff --git a/cmd/dashboard/main.go b/cmd/dashboard/main.go
index 5f76afc..39a9dff 100644
--- a/cmd/dashboard/main.go
+++ b/cmd/dashboard/main.go
@@ -120,7 +120,11 @@ func cleanMonitorHistory() {
 	for id, couldRemove := range specialServerKeep {
 		dao.DB.Unscoped().Delete(&model.Transfer{}, "id = ? AND created_at < ?", id, couldRemove)
 	}
-	dao.DB.Unscoped().Delete(&model.Transfer{}, "id NOT IN (?) AND created_at < ?", specialServerIDs, allServerKeep)
+	if allServerKeep.IsZero() {
+		dao.DB.Unscoped().Delete(&model.Transfer{}, "id NOT IN (?)", specialServerIDs)
+	} else {
+		dao.DB.Unscoped().Delete(&model.Transfer{}, "id NOT IN (?) AND created_at < ?", specialServerIDs, allServerKeep)
+	}
 }
 
 func loadServers() {
diff --git a/service/dao/dao.go b/service/dao/dao.go
index d0dbada..0b9096e 100644
--- a/service/dao/dao.go
+++ b/service/dao/dao.go
@@ -13,7 +13,7 @@ import (
 	pb "github.com/naiba/nezha/proto"
 )
 
-var Version = "v0.9.0" // ！！记得修改 README 中的 badge 版本！！
+var Version = "v0.9.1" // ！！记得修改 README 中的 badge 版本！！
 
 var (
 	Conf  *model.Config