Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /var/www/clients/client1/web7/web/biblioteka.php:88
Stack trace:
#0 /var/www/clients/client1/web7/web/biblioteka.php(143): generateSub()
#1 /var/www/clients/client1/web7/web/index.php(120): include('...')
#2 {main}
thrown in /var/www/clients/client1/web7/web/biblioteka.php on line 88