Call to undefined function MageWorx\GeoIP\Model\geoip_open()

Hi
I checked the logs and came across this exception.
Can you tell me what it means?

The name of the log file is: mage2pro.exception-2016-08-23–17-18.log so I presume it is something to do with the Stripe module.

[E_ERROR] Call to undefined function MageWorx\GeoIP\Model\geoip_open()
Файл: /chroot/home/asenaand/seamlessphoto.com/html/app/code/MageWorx/GeoIP/Model/Geoip.php
Строка: 112

Regards
Dave

The error is not related to the Stripe module, its source is MageWorx GeoIP module.
Please contact the MageWorx GeoIP developers for support.

ok thanks