Error

Message: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /var/www/html/includes/rules/main.php:67 Stack trace: #0 /var/www/html/includes/rules/main.php(67): mysqli_num_rows() #1 /var/www/html/rules.php(114): get_lists() #2 {main} thrown
File: /var/www/html/includes/rules/main.php
Line: 67