Fatal error: Uncaught MongoDB\Driver\Exception\CommandException: invalid argument to $skip stage: Expected a positive number in: $skip: -12 in /var/www/html/dolphin/Dolphin_hotelSudItalia.class.php:399 Stack trace: #0 /var/www/html/dolphin/Dolphin_hotelSudItalia.class.php(399): MongoDB\Driver\Manager->executeCommand() #1 /var/www/html/hotelsuditalia/results.php(98): Dolphin_hotelSudItalia->getHotelsWebBis() #2 {main} thrown in /var/www/html/dolphin/Dolphin_hotelSudItalia.class.php on line 399