[Perl]Method of tables() can't return values

Test Build:CUBRID 2008 R4.0 (8.4.0.2019) (64bit release build for linux_gnu)
OS: Linux 64
Description: Method of tables() can't return values

Repro Steps:
perl tables_02.pl

statements in tables_02.pl:

$dbh->do("CREATE TABLE a_tbl(id INT NOT NULL,phone VARCHAR(10));") or die "create error: $dbh->errstr";
$dbh->do("INSERT INTO a_tbl VALUES(1,'111-1111'), (2,'222-2222'), (3, '333-3333'), (4, NULL), (5, NULL);") or die "insert error: $dbh->errs
tr ";
$dbh->do("CREATE VIEW b_view AS SELECT * FROM a_tbl WHERE phone IS NOT NULL WITH CHECK OPTION;") or die "create view error: $dbh->errstr";

my @tables=$dbh->tables();
print "address of @tables: ";
print @tables ."\n";

print "content of @tables: ";
print "@tables \n\n";
foreach my $table (@tables){ print "Table Name: $table \n"; }

Actual result:

Use of uninitialized value $table in concatenation (.) or string at /home/perl/opt/perl5/lib/site_perl/5.14.1/x86_64-linux/DBD/cubrid.pm line 246.
address of @tables: ARRAY(0xce201d0)
content of @tables:

Expect result:

address of @tables: ARRAY(0xce201d0)
content of @tables: `a_tbl` `b_view`  

Table Name: `a_tbl` 
Table Name: `b_view`