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Firewall or closed port 43 is the most common problem that WHOIS option does not work.
.
Solution 1: (recommended)
Make sure your system (the webserver JoomlaStats is configured on) can open an outgoing connection on port 43 to whois.ripe.net
. This way all possible visits will be related to their countries
Solution 2:
Upload data to JoomlaStats database and turn off WHOIS option in configuration.
JoomlaStats is looking for developer who implement this feature.
. Most visitors will be related to their countries
Solution 3 (not recommended):
Turn off WHOIS option in configurations (menu->JoomlaStats->Configuration->Whois option)
Remember that JoomlaStats will be unable to find country for some visitrors visitors.