diff --git a/configui.go b/configui.go
index f5d7176..b957dd7 100644
--- a/configui.go
+++ b/configui.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"html/template"
 	"os"
+	"sync"
 	"time"
 
 	"kumoly.io/lib/klog"
@@ -17,7 +18,7 @@ import (
 var UNIX_SHELL = "sh"
 var WIN_SHELL = "cmd"
 
-const version = "v0.1.3"
+const version = "v0.1.8"
 
 //go:embed templates
 var tmplFS embed.FS
@@ -52,12 +53,13 @@ type ConfigUI struct {
 	LogPath  string `json:"log_path"`
 	LogLevel int    `json:"log_level"`
 
-	TmplFS   embed.FS `json:"-"`
-	tmpl     *engine.Engine
-	PublicFS embed.FS     `json:"-"`
-	log      *klog.Logger `json:"-"`
-	ksrv_log *klog.Logger `json:"-"`
-	f        *os.File     `json:"-"`
+	TmplFS     embed.FS `json:"-"`
+	tmpl       *engine.Engine
+	PublicFS   embed.FS     `json:"-"`
+	log        *klog.Logger `json:"-"`
+	ksrv_log   *klog.Logger `json:"-"`
+	f          *os.File     `json:"-"`
+	configLock sync.Mutex   `json:"-"`
 }
 
 func New() *ConfigUI {
@@ -119,6 +121,8 @@ func (cui *ConfigUI) LoadConfig(confstr string) error {
 	}
 
 	// copy
+	cui.configLock.Lock()
+	defer cui.configLock.Unlock()
 	cui.fileIndex = tmpIndex
 	cui.Files = tmpConf.Files
 	cui.AllowIP = tmpConf.AllowIP
@@ -127,6 +131,7 @@ func (cui *ConfigUI) LoadConfig(confstr string) error {
 	cui.ConfigPath = tmpConf.ConfigPath
 	cui.HideConfig = tmpConf.HideConfig
 	cui.NoReconfig = tmpConf.NoReconfig
+	cui.ResultBellow = tmpConf.ResultBellow
 
 	cui.AppName = tmpConf.AppName
 	if cui.AppName == "" {
@@ -149,9 +154,6 @@ func (cui *ConfigUI) LoadConfig(confstr string) error {
 
 	cui.log = klog.Sub(cui.AppName)
 
-	// NOT implemented
-	cui.ResultBellow = tmpConf.ResultBellow
-
 	cui.LogLevel = tmpConf.LogLevel
 	if cui.LogLevel == 0 {
 		cui.LogLevel = klog.Lerror | klog.Linfo