Hi, this is a 'bug' of vbWiki Standard.
Who's online integration is implemented in the Pro version. The standard (lite) version doesn't have the functionality required to fully extract the wiki article titles and build the URLs to the corresponding pages on the wiki side.
To keep vbWiki Standard from showing visitors to your wiki on the Who's Online page, open arcane_vbulletin_core.php, and find this line of code:
PHP Code:
define('AT_VB_INTEGRATION', 1);
And insert right after:
PHP Code:
define( 'LOCATION_BYPASS', 1 );