Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /customers/c/e/7/lottrup.org/httpd.www/TNG14/tngconnect.php:142
Stack trace:
#0 /customers/c/e/7/lottrup.org/httpd.www/TNG14/tngconnect.php(142): mysqli_num_rows(false)
#1 /customers/c/e/7/lottrup.org/httpd.www/TNG14/heatmap.php(218): tng_num_rows(false)
#2 {main}
  thrown in /customers/c/e/7/lottrup.org/httpd.www/TNG14/tngconnect.php on line 142