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Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, null given in /var/www/html/php/link.php:13
Stack trace:
#0 /var/www/html/php/link.php(13): mysqli_num_rows()
#1 /var/www/html/category.php(383): mysql_num_rows()
#2 {main}
thrown in /var/www/html/php/link.php on line 13
