diff --git a/object/site_timer.go b/object/site_timer.go
index 4fb962f..e5899dd 100644
--- a/object/site_timer.go
+++ b/object/site_timer.go
@@ -16,10 +16,14 @@ package object
 
 import (
 	"fmt"
+	"sync"
 	"time"
 )
 
-var siteUpdateMap = map[string]string{}
+var (
+	siteUpdateMap = map[string]string{}
+	lock          = &sync.Mutex{}
+)
 
 func monitorSites() error {
 	sites, err := GetGlobalSites()
@@ -33,7 +37,9 @@ func monitorSites() error {
 		//	continue
 		//}
 
+		lock.Lock()
 		err = site.checkNodes()
+		lock.Unlock()
 		if err != nil {
 			return err
 		}
diff --git a/web/src/SiteListPage.js b/web/src/SiteListPage.js
index e6d2f81..b413e59 100644
--- a/web/src/SiteListPage.js
+++ b/web/src/SiteListPage.js
@@ -107,13 +107,13 @@ class SiteListPage extends React.Component {
   }
 
   renderTable(sites) {
-    const renderExternalLink = () => {
-      return (
-        <svg style={{marginLeft: "5px"}} width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" className="iconExternalLink_nPIU">
-          <path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path>
-        </svg>
-      );
-    };
+    // const renderExternalLink = () => {
+    //   return (
+    //     <svg style={{marginLeft: "5px"}} width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" className="iconExternalLink_nPIU">
+    //       <path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path>
+    //     </svg>
+    //   );
+    // };
 
     const columns = [
       {
@@ -309,25 +309,25 @@ class SiteListPage extends React.Component {
           );
         },
       },
-      {
-        title: i18next.t("site:Casdoor app"),
-        dataIndex: "casdoorApplication",
-        key: "casdoorApplication",
-        width: "140px",
-        sorter: (a, b) => a.casdoorApplication.localeCompare(b.casdoorApplication),
-        render: (text, record, index) => {
-          if (text === "") {
-            return null;
-          }
-
-          return (
-            <a target="_blank" rel="noreferrer" href={Setting.getMyProfileUrl(this.state.account).replace("/account", `/applications/${this.props.account.owner}/${text}`)}>
-              {text}
-              {renderExternalLink()}
-            </a>
-          );
-        },
-      },
+      // {
+      //   title: i18next.t("site:Casdoor app"),
+      //   dataIndex: "casdoorApplication",
+      //   key: "casdoorApplication",
+      //   width: "140px",
+      //   sorter: (a, b) => a.casdoorApplication.localeCompare(b.casdoorApplication),
+      //   render: (text, record, index) => {
+      //     if (text === "") {
+      //       return null;
+      //     }
+      //
+      //     return (
+      //       <a target="_blank" rel="noreferrer" href={Setting.getMyProfileUrl(this.state.account).replace("/account", `/applications/${this.props.account.owner}/${text}`)}>
+      //         {text}
+      //         {renderExternalLink()}
+      //       </a>
+      //     );
+      //   },
+      // },
       {
         title: i18next.t("general:Action"),
         dataIndex: "action",