diff --git a/web/html/form/client.html b/web/html/form/client.html
index 846bbd135..908f28d22 100644
--- a/web/html/form/client.html
+++ b/web/html/form/client.html
@@ -44,7 +44,7 @@
             <a-select-option v-for="key in USERS_SECURITY" :value="key">[[ key ]]</a-select-option>
         </a-select>
     </a-form-item>
-    <a-form-item v-if="client.email && app.subSettings.enable">
+    <a-form-item v-if="client.email && app.subSettings?.enable">
         <template slot="label">
             <a-tooltip>
                 <template slot="title">
diff --git a/web/html/modals/client_bulk_modal.html b/web/html/modals/client_bulk_modal.html
index d6bcfcd6f..ac0fa0112 100644
--- a/web/html/modals/client_bulk_modal.html
+++ b/web/html/modals/client_bulk_modal.html
@@ -39,7 +39,7 @@
                 <a-select-option v-for="key in TLS_FLOW_CONTROL" :value="key">[[ key ]]</a-select-option>
             </a-select>
         </a-form-item>
-        <a-form-item v-if="app.subSettings.enable">
+        <a-form-item v-if="app.subSettings?.enable">
             <template slot="label">
                 <a-tooltip>
                     <template slot="title">
diff --git a/web/html/modals/qrcode_modal.html b/web/html/modals/qrcode_modal.html
index 5d3d05a8f..e67dc6403 100644
--- a/web/html/modals/qrcode_modal.html
+++ b/web/html/modals/qrcode_modal.html
@@ -21,7 +21,7 @@
     </a-space>
   </template>
   <tr-qr-modal class="qr-modal">
-    <template v-if="app.subSettings.enable && qrModal.subId">
+    <template v-if="app.subSettings?.enable && qrModal.subId">
       <tr-qr-box class="qr-box">
         <a-tag color="purple" class="qr-tag"><span>{{ i18n "pages.settings.subSettings"}}</span></a-tag>
         <tr-qr-bg class="qr-bg-sub">