Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /customers/f/6/a/olsen-mail.dk/httpd.www/slaegt/tngconnect.php:99
Stack trace:
#0 /customers/f/6/a/olsen-mail.dk/httpd.www/slaegt/tngconnect.php(99): mysqli_num_rows(false)
#1 /customers/f/6/a/olsen-mail.dk/httpd.www/slaegt/heatmap.php(217): tng_num_rows(false)
#2 {main}
  thrown in /customers/f/6/a/olsen-mail.dk/httpd.www/slaegt/tngconnect.php on line 99