Drush reports errors when running cron on Drupal 6.19 site using PostgreSQL

Not sure if this info might impact the outcome of this report or not, but this site ran on MySQL for a number of years before I recently migrated it to PostgreSQL. Since then, drush cron is failing, and sitename.com/cron.php does not produce any errors.

Out put of the error is:

WD php: pg_query(): Query failed: ERROR: LIMIT #,# syntax is not [error]
supported
HINT: Use separate LIMIT and OFFSET clauses. in
/home2/althusiu/public_html/includes/database.pgsql.inc on line 139.
WD php: [error]
query: SELECT u.uid, u.name, u.mail, fbr.email_hash FROM users u LEFT
JOIN fb_register fbr ON fbr.uid=u.uid WHERE (fbr.uid IS NULL OR u.uid
> 0) AND u.mail IS NOT NULL AND u.mail '' ORDER BY u.uid LIMIT 0,
100 in
/home2/althusiu/public_html/sites/all/modules/fb/contrib/fb_register.module
on line 174.
Cron run successfully. [success]
pg_query(): Query failed: ERROR: LIMIT #,# syntax is not supported [warning]
HINT: Use separate LIMIT and OFFSET clauses. in
/home2/althusiu/public_html/includes/database.pgsql.inc on line 139.
[error]
query: SELECT u.uid, u.name, u.mail, fbr.email_hash FROM users u LEFT
JOIN fb_register fbr ON fbr.uid=u.uid WHERE (fbr.uid IS NULL OR u.uid
> 0) AND u.mail IS NOT NULL AND u.mail <> '' ORDER
BY u.uid LIMIT 0, 100 in
/home2/althusiu/public_html/sites/all/modules/fb/contrib/fb_register.module
on line 174.
An error occurred at function : drush_core_cron

The errors are being report on stdout, rather than stderr, and it says cron ran successfully inspite of the errors.