Warning: Trying to access array offset on value of type null in /volume1/web/TMPweb/advert/product.php on line 13

Fatal error: Uncaught TypeError: mysqli_fetch_assoc(): Argument #1 ($result) must be of type mysqli_result, bool given in /volume1/web/TMPweb/advert/product.php:14
Stack trace:
#0 /volume1/web/TMPweb/advert/product.php(14): mysqli_fetch_assoc(false)
#1 {main}
  thrown in /volume1/web/TMPweb/advert/product.php on line 14