foreach my $sub_user_error (@db_user_errors)
{
     if ($db_error_data{$hour}{'Submission_user_error'}{$sub_user_error} eq "")
     {
         $worksheet->write( $row, $col, 0, $number);
         $col++;
     }
     else
     {
         $worksheet->write( $row, $col, $db_error_data{$hour}{'Submission_user_error'}{$sub_user_error}, $number);
         $col++;
     }
}
$row++;