Quiz

I am getting the same error 1259 times, any luck?

[08-Nov-2007 16:46:26] PHP Warning:  Cannot use a scalar value as an array in C:\moodle\mod\quiz\report\analysis\report.php on line 657

I look at the code and this functions seem to be the problem:

function stats_sumx($sum, $data){
 line 657 -->  $sum[0] += $data[0];
line 658 -->   $sum[1] += $data[1];
    return $sum;
}      

function stats_sumx2($sum, $data){
line 663-->    $sum[0] += $data[0]*$data[0];
line 664-->    $sum[1] += $data[1]*$data[1];
    return $sum;
}   

function stats_sumxy($sum, $data){
line 669-->    $sum[0] += $data[0]*$data[1];
line 670-->    $sum[1] += $data[1]*$data[0];
    return $sum;
}

By the way i just upgraded to PHP 5, i really don't know if that would cause this error.