Error .. 1054 MYSQL .. Where Clause seems correct .. ideas?

[LBSources]

ive seen the page before i was more hoping for somone to point out the error if it jumped out at them ..

I see the section you are pointing out, but how can i also set that syntax in this code.

cause it seems the problem is at this section

$headerguests=$db->query_first("SELECT COUNT(*) AS count FROM " . TABLE_PREFIX . "session WHERE userid=0 AND lastactivity>$datecut");