fix

admin/main/submenu/null_table/index.php

@@ -11,9 +11,9 @@ require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_admi
  */
 $ormTable = resolve(NullTable::class);
 
-$tableAdminPage = new TableAdminPage($ormTable, $_REQUEST, '/bitrix/admin/bx_null.main.null_table_row.php');
+$tableAdminPage = new TableAdminPage($ormTable, $_REQUEST, '/bitrix/admin/bx_null.main.null_table.null_table_row.php');
 $tableAdminPage
-    ->checkPermission('bx.null')
+    ->checkPermission()
     ->start()
     ->show();
 

admin/main/submenu/null_table/submenu/null_table_row/index.php

@@ -12,7 +12,7 @@ require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_admi
 $ormTable = resolve(NullTable::class);
 
 $AdminPageTableRow = new TableRowAdminPage($ormTable, $_REQUEST, '/bitrix/admin/bx_null.main.null_table.php');
-$AdminPageTableRow->checkPermission('bx.null');
+$AdminPageTableRow->checkPermission();
 $AdminPageTableRow->start();
 
 \CJSCore::Init('jquery');

admin/main/submenu/settings/config.php

@@ -12,7 +12,12 @@ return array(
     'MAIN' => array(
         'TITLE' => 'Общие сведения',
         'OPTIONS' => array(
-
+            'ENABLE' => array(
+                'TITLE' => 'Enable module',
+                'TYPE' => 'checkbox',
+                'DEFAULT' => 'N',
+                'HINT' => '',
+            ),
         ),
     ),
     'DOCS' => array(