Install fails on PostgreSQL [#1386120]

When I'm trying to install module on Drupal 7.10 (PostgreSQL):

WD php: PDOException: SQLSTATE[42601]: Syntax error: 7 ERROR:  syntax error at or near "Array"                                                                 [error]
LINE 5:  PRIMARY KEY (Array, Array)
                      ^: CREATE TABLE {block_class} (
        module varchar(255) NOT NULL default '',
        delta varchar(255) NOT NULL default '',
        css_class varchar(255) NOT NULL default '',
        PRIMARY KEY (Array, Array)
); Array
(
)
 in db_create_table() (line 2684 of /var/www/drupal-7.10-2/includes/database/database.inc).
Cannot modify header information - headers already sent by (output started at /home/stepan/.drush/includes/drush.inc:596) bootstrap.inc:1221                   [warning]
PDOException: SQLSTATE[42601]: Syntax error: 7 ERROR:  syntax error at or near "Array"
LINE 5:  PRIMARY KEY (Array, Array)
                      ^: CREATE TABLE {block_class} (
        module varchar(255) NOT NULL default &#039;&#039;,
        delta varchar(255) NOT NULL default &#039;&#039;,
        css_class varchar(255) NOT NULL default &#039;&#039;,
        PRIMARY KEY (Array, Array)
); Array
(
)
 in db_create_table() (line 2684 of /var/www/drupal-7.10-2/includes/database/database.inc).