Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, null given in /var/www/web/core/includes/mysqli.inc.php:390
Stack trace:
#0 /var/www/web/core/includes/mysqli.inc.php(390): mysqli_num_rows(NULL)
#1 /var/www/web/core/includes/mysqli.inc.php(751): mysql2i::mysql_num_rows(NULL)
#2 /var/www/web/articles/article.php(131): mysql_num_rows(NULL)
#3 {main}
  thrown in /var/www/web/core/includes/mysqli.inc.php on line 390