fix

admin/main/submenu/nullable_table/menu.php

@@ -0,0 +1,14 @@
+<?php
+
+use \Bitrix\Main\Localization\Loc;
+use Wt\Core\Admin\GlobalMenuItem;
+
+Loc::loadMessages(__FILE__);
+
+
+return (new GlobalMenuItem())
+    ->setVisible(false)
+    ->setSort(1300)
+    ->setTitle('Nullable Table')
+    ->setIcon('iblock_menu_icon_iblocks')
+    ->setUrl();