diff --git a/Plugson/www/plugson_auto_install.html b/Plugson/www/plugson_auto_install.html
index ec5410b9..4b3066c0 100644
--- a/Plugson/www/plugson_auto_install.html
+++ b/Plugson/www/plugson_auto_install.html
@@ -107,8 +107,8 @@
     var id = $(this).attr('id');
     var value = $(this).val();
     var intval;
-    
-    if (id.length <= 16) {
+
+    if (typeof(id) == 'undefined' || id.length <= 16) {
       return;
     }
 
@@ -146,7 +146,7 @@
     var id = $(this).attr('id');
     var checked = $(this).is(':checked');
 
-    if (id.length <= 14) {
+    if (typeof(id) == 'undefined' || id.length <= 14) {
       return;
     }
 
@@ -279,7 +279,9 @@
 
     $('input[type=text]').each(function (){
       var id = $(this).attr('id');
-      
+      if (typeof(id) == 'undefined') {
+        return;
+      }
       if (id.startsWith('id_text_timeout_') || id.startsWith('id_text_autosel_')) {
         $(this).change(OnInputTextChange);
       }
@@ -287,6 +289,9 @@
 
     $('input[type=checkbox]').each(function (){
       var id = $(this).attr('id');
+      if (typeof(id) == 'undefined') {
+        return;
+      }
       if (id.startsWith('id_timeout_en_') || id.startsWith('id_autosel_en_')) {
         $(this).click(OnCheckBoxChange);
       }
diff --git a/Plugson/www/plugson_control.html b/Plugson/www/plugson_control.html
index 60c8fc75..b6864556 100644
--- a/Plugson/www/plugson_control.html
+++ b/Plugson/www/plugson_control.html
@@ -1182,7 +1182,7 @@
 
   $('input[type=radio]').each(function(){
     var id = $(this).attr('id');
-    if (id.startsWith('id_ctrl')) {
+    if (typeof(id) != 'undefined' && id.startsWith('id_ctrl')) {
       $(this).change(VtoySaveCurrentPage);
     }
   });
diff --git a/Plugson/www/plugson_image_list.html b/Plugson/www/plugson_image_list.html
index 4fc770fe..ff538ba1 100644
--- a/Plugson/www/plugson_image_list.html
+++ b/Plugson/www/plugson_image_list.html
@@ -176,7 +176,7 @@
 
   $('input[type=radio]').each(function(){
     var id = $(this).attr('id');
-    if (id.startsWith('id_image_list_type')) {
+    if (typeof(id) != 'undefined' && id.startsWith('id_image_list_type')) {
       $(this).change(VtoySaveCurrentPage);
     }
   });
diff --git a/Plugson/www/plugson_persistence.html b/Plugson/www/plugson_persistence.html
index 03d5bea6..60e01348 100644
--- a/Plugson/www/plugson_persistence.html
+++ b/Plugson/www/plugson_persistence.html
@@ -108,7 +108,7 @@
     var value = $(this).val();
     var intval;
     
-    if (id.length <= 16) {
+    if (typeof(id) == 'undefined' || id.length <= 16) {
       return;
     }
 
@@ -146,7 +146,7 @@
     var id = $(this).attr('id');
     var checked = $(this).is(':checked');
 
-    if (id.length <= 14) {
+    if (typeof(id) == 'undefined' || id.length <= 14) {
       return;
     }
 
@@ -280,6 +280,9 @@
 
     $('input[type=text]').each(function (){
       var id = $(this).attr('id');
+      if (typeof(id) == 'undefined') {
+        retunrn;
+      }
       
       if (id.startsWith('id_text_timeout_') || id.startsWith('id_text_autosel_')) {
         $(this).change(OnInputTextChange);
diff --git a/Plugson/www/plugson_theme.html b/Plugson/www/plugson_theme.html
index 16bc9733..b30d19a0 100644
--- a/Plugson/www/plugson_theme.html
+++ b/Plugson/www/plugson_theme.html
@@ -299,7 +299,7 @@
 
     $('input[type=radio]').each(function(){
       var id = $(this).attr('id');
-      if (id.startsWith('id_theme_file')) {
+      if (typeof(id) != 'undefined' && id.startsWith('id_theme_file')) {
         $(this).change(function() {
           m_data_theme[current_tab_index].default_file =parseInt(id.substr(id.length - 1));
           VtoySaveCurrentPage();