janharders - 6:36 pm on Sep 13, 2012 (gmt 0)

Or maybe there's some if-clause that just sets in sometimes and does it.

basically: the script is calling
$sth->selectrow_array (while $sth can be anything, it's the name of the statement handle) without executing a query. So it is asking for the result data but has not run a query. Look at line 126 for the variable name and then find $variablename->execute