Fatal error: Uncaught mysqli_sql_exception: Expression #12 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'nfz2023.ak.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by in /var/www/html/class/mysql.class.php:53 Stack trace: #0 /var/www/html/class/mysql.class.php(53): mysqli_query() #1 /var/www/html/class/aktualnosci.class.php(669): mysql->select() #2 /var/www/html/php/aktualnosci/lista.php(11): aktualnosci->getWiadomosciArchiwum() #3 /var/www/html/php/strony/strony.php(105): require_once('...') #4 /var/www/html/php/strony/kontrast.php(5): require_once('...') #5 /var/www/html/index.php(12): require_once('...') #6 {main} thrown in /var/www/html/class/mysql.class.php on line 53