BuddyPress.org

I’ve just realized I have a couple of warnings from WordPress, don’t know if this can be helpful to help me out:

Warning: mysql_real_escape_string(): 11 is not a valid MySQL-Link resource in /path/to/wp-includes/wp-db.php on line 785
Warning: mysql_error(): 11 is not a valid MySQL-Link resource in /path/to/wp-includes/wp-db.php on line 1119

These happens only when calling the above stated functions of BuddyPress.
Thanks!