Warning: Undefined variable $conn in /home/runner/workspace/categories/subcategories.php on line 17

Fatal error: Uncaught TypeError: pg_query_params(): Argument #1 ($connection) must be of type PgSql\Connection, null given in /home/runner/workspace/includes/functions.php:50 Stack trace: #0 /home/runner/workspace/includes/functions.php(50): pg_query_params(NULL, 'SELECT id, name...', Array) #1 /home/runner/workspace/categories/subcategories.php(17): getCategoryById(NULL, 15) #2 {main} thrown in /home/runner/workspace/includes/functions.php on line 50