Uncaught Error: Cannot use object of type WP_Post_Type as array in /../Metaboxes.php on line 383

The error occurs when going to the Appearance -> Menu.

<img width="949" alt="Image" src="https://github.com/user-attachments/assets/0e1240cd-4df4-4c19-9612-8c1222f838b3" />