Social groups error: Only variables can be passed

[VGPelega]

Hi there, I have come back to my vb social groups mod, and I am at a stage where I could really do with using it on my website.

Let me give some background information. I upgraded from 3.6.7 - 3.6.8 then I went onto vb, 3.7 gold, and now I am running 3.7.2. But I have never been able to use the social groups feature, and each time I try to create a new social group, I get the following error:

Fatal error: Only variables can be passed by reference in /home/MYROOT/public_html/forums/group.php on line 804

This is the line of code on the groups.php file (plus the surrounding code lines 799 - 813):

// ############# Do we need group owner info? ############################
if ($_REQUEST['do'] == 'edit' OR $_POST['do'] == 'doedit' OR $_REQUEST['do'] == 'create' OR $_POST['do'] == 'docreate')
{
if (!empty($group))
{
$groupowner = fetch_userinfo($group['creatoruserid']);
cache_permissions($groupowner);
}
else
{
$groupowner = $vbulletin->userinfo;
}
}

// ################################################## #####################

The line in red is line 804, and I am just really confused as to what is the cause of this fatal error. Could someone point me in the right direction in order to repair this issue?

I am really at a loss on this, and don't know where to start, but I am very willing to make a start. Any help would be appreciated.