[Perl]Error doesn't appear when binding an error type to cubrid_lob_import method

Test Build:CUBRID 2008 R4.0 (8.4.0.2019) (64bit release build for linux_gnu)
OS: Linux 64
Description: Error doesn't appear when binding an error type to cubrid_lob_import method

Repro Steps
perl import_2.pl

statements in import_2.pl:
my $sth=$dbh->prepare("insert into import_1 values(?,?);") or die "prepare error: $dbh->errstr";
$sth->bind_param (1, 1) or die "bind_param error: $dbh->errstr";
my $importValue=$sth->cubrid_lob_import (2, "import1.txt", DBI::SQL_TIME) or die $dbh->errstr . " cubrid_lob_import error\n";

Actual result:

no error;
this record was inserted into database;

csql -udba demodb;
csql> select * from import_1;

=== <Result of SELECT Command in Line 1> ===

  doc_id                content             
============================================
  '1'                   file:/home/perl/CUBRID/databases/pldb/lob/ces_257/import_1.00001326245606685734_8184

Expect result:

errror appear;
this record wasn't successfully inserted into database