diff --git a/kernel/api/setting.go b/kernel/api/setting.go
index de1a36a8d..079c07969 100644
--- a/kernel/api/setting.go
+++ b/kernel/api/setting.go
@@ -152,7 +152,7 @@ func setFiletree(c *gin.Context) {
 		return
 	}
 
-	fileTree := &conf.FileTree{}
+	fileTree := conf.NewFileTree()
 	if err = gulu.JSON.UnmarshalJSON(param, fileTree); nil != err {
 		ret.Code = -1
 		ret.Msg = err.Error()
@@ -166,6 +166,12 @@ func setFiletree(c *gin.Context) {
 		}
 	}
 
+	if 1 > fileTree.MaxOpenTabCount {
+		fileTree.MaxOpenTabCount = 12
+	}
+	if 32 < fileTree.MaxOpenTabCount {
+		fileTree.MaxOpenTabCount = 32
+	}
 	model.Conf.FileTree = fileTree
 	model.Conf.Save()
 
diff --git a/kernel/model/conf.go b/kernel/model/conf.go
index ce6a1f882..fc78fee7d 100644
--- a/kernel/model/conf.go
+++ b/kernel/model/conf.go
@@ -133,6 +133,9 @@ func InitConf() {
 	if 1 > Conf.FileTree.MaxOpenTabCount {
 		Conf.FileTree.MaxOpenTabCount = 12
 	}
+	if 32 < Conf.FileTree.MaxOpenTabCount {
+		Conf.FileTree.MaxOpenTabCount = 32
+	}
 	if nil == Conf.Tag {
 		Conf.Tag = conf.NewTag()
 	}