Zabbix API returns empty result when using parameter "limit" for method "trigger.get".

Example:

When using the following parameters

{"output":"extend","withLastEventUnacknowledged":1,"limit":5}

for the "trigger.get" method Zabbix API returns empty result:

2 ----->
{"jsonrpc":"2.0","method":"trigger.get","params":

{"output":"extend","withLastEventUnacknowledged":1,"limit":5}

,"auth":"b6cb98469a14f7f1c818acab93f67844","id":2}

<-----

{"jsonrpc":"2.0","result":[],"id":2}

But when using parameters

{"output":"extend","withLastEventUnacknowledged":1}

got successful result:

{"jsonrpc":"2.0","result":[{"triggerid":"15048","expression":"

{16528}

>0","description":"Host information was changed on

{HOSTNAME}

","url":"","status":"0","value":"0","priority":"1","lastchange":"1301399382","dep_level":"0","comments":"","error":"","templateid":"10044","type":"0"},{"triggerid":"15146","expression":"

{16702}

>1","description":"vm.memory.size[pfree].last(0)}>1","url":"","status":"0","value":"2","priority":"4","lastchange":"1297769020","dep_level":"0","comments":"","error":"Host is unavailable.","templateid":"0","type":"0"}