strlen(): Argument #1 ($string) must be of type string, array given

Problem/Motivation

TypeError : strlen(): Argument #1 ($string) must be of type string, array given ( in strlen() of /code/web/core/lib/Drupal/Component/Utility/Unicode.php on line 395 )

Steps to reproduce

Drupal - 10.5.1
tb_megamenu - 3.0.0-alpha4

Login with admin and open admin/structure/tb-megamenu/menu_machine_name