Perhaps the error isn't where you think it is. Look:
while (my @row = $common::sql::sth->fetchrow()){
my $daily_time = sprintf("%d:%02d",$row[4],$row[5]);
my ($total_minutes, $total_hours, $all_minutes, $total_time_hours, $to
+tal_time_minutes);
$total_minutes = $row[5];
$total_hours = $row[4] * 60;
$all_minutes = $total_hours + $total_minutes;
$total_time = $total_time + $all_minutes;
I don't see $total_time declared, and I don't see it initialized before it's used here.
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