Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /home/shukam/domains/shukam.pl/public_html/classes/mysql.class.php:261 Stack trace: #0 /home/shukam/domains/shukam.pl/public_html/classes/mysql.class.php(261): mysqli_num_rows(false) #1 /home/shukam/domains/shukam.pl/public_html/modules/users/users.class.php(244): MySQL->sqlCheck('ogloszenia_bloc...', 'ip='18.221.222....') #2 /home/shukam/domains/shukam.pl/public_html/modules/users/users.class.php(57): user->isBlockedIp('18.221.222.47') #3 /home/shukam/domains/shukam.pl/public_html/header.php(209): user->__construct() #4 /home/shukam/domains/shukam.pl/public_html/content.php(10): include('/home/shukam/do...') #5 {main} thrown in /home/shukam/domains/shukam.pl/public_html/classes/mysql.class.php on line 261