Site is broken when plugin is active

Hello! I installed your plugin on localhost. Me grid is OS v.0.9.2.2. WP version -6.1.1. PHP – 8.0.7. Plugin installs well and connected to my DB too.
So, when plugin is active, all pages becomes unavailable for visit. It shows error:

Fatal error: Uncaught TypeError: array_unique(): Argument #1 ($array) must be of type array, null given in D:\DataBase\root\wp-includes\post-template.php:855 Stack trace: #0 D:\DataBase\root\wp-includes\post-template.php(855): array_unique(NULL) #1 D:\DataBase\root\wp-includes\post-template.php(612): get_body_class(Array) #2 D:\DataBase\root\wp-includes\template-canvas.php(20): body_class() #3 D:\DataBase\root\wp-includes\template-loader.php(106): include('D:\\DataBase...') #4 D:\DataBase\root\wp-blog-header.php(19): require_once('D:\\DataBase...') #5 D:\DataBase\root\index.php(17): require('D:\\DataBase...') #6 {main} thrown in D:\DataBase\root\wp-includes\post-template.php on line 855

Wats wrong?
Thank you!