Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /www/wwwroot/gys.anjsy.cn/vendors_list.php:61 Stack trace: #0 /www/wwwroot/gys.anjsy.cn/vendors_list.php(61): mysqli_num_rows() #1 {main} thrown in /www/wwwroot/gys.anjsy.cn/vendors_list.php on line 61