Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /var/www/icd-10.jdmt.ch/bfs_new_permutation_fixing.php:43 Stack trace: #0 {main} thrown in /var/www/icd-10.jdmt.ch/bfs_new_permutation_fixing.php on line 43