When deleting an user the following error occurs:

pg_query() [<a href='function.pg-query'>function.pg-query</a>]: Query failed: ERROR: argument of AND must be type boolean, not type integer[/home/demo/public_html/include/db.inc.php:487]
Error in query [DELETE FROM operations WHERE 0 AND (objectid IN (608)) ] [ERROR: argument of AND must be type boolean, not type integer]
pg_query() [<a href='function.pg-query'>function.pg-query</a>]: Query failed: ERROR: current transaction is aborted, commands ignored until end of transaction block[/home/demo/public_html/include/db.inc.php:487]
Error in query [DELETE FROM media WHERE (userid IN (608)) ] [ERROR: current transaction is aborted, commands ignored until end of transaction block]
pg_query() [<a href='function.pg-query'>function.pg-query</a>]: Query failed: ERROR: current transaction is aborted, commands ignored until end of transaction block[/home/demo/public_html/include/db.inc.php:487]
Error in query [DELETE FROM profiles WHERE (userid IN (608)) ] [ERROR: current transaction is aborted, commands ignored until end of transaction block]
pg_query() [<a href='function.pg-query'>function.pg-query</a>]: Query failed: ERROR: current transaction is aborted, commands ignored until end of transaction block[/home/demo/public_html/include/db.inc.php:487]
Error in query [DELETE FROM users_groups WHERE (userid IN (608)) ] [ERROR: current transaction is aborted, commands ignored until end of transaction block]
pg_query() [<a href='function.pg-query'>function.pg-query</a>]: Query failed: ERROR: current transaction is aborted, commands ignored until end of transaction block[/home/demo/public_html/include/db.inc.php:487]
Error in query [DELETE FROM users WHERE (userid IN (608)) ] [ERROR: current transaction is aborted, commands ignored until end of transaction block]
[ CUser::delete ] Unknown ZABBIX internal error