I am new to wordpress and was encountered the Warning: Undefined array key 5408 in C:\xampp\htdocs\Bridge\wp-includes\nav-menu-template.php on line 210, is there any solution for me to fix this issue?
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How to fix the wordpress error: Warning: Undefined array key htdocs\Bridge\wp-includes\nav-menu-template.php on line 210?
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Your $menu_items_with_children is just an empty array! Please check it carefully.