Ajax返回0并剪切

there, I have php action_events_work_time that answer:

Array
(
    [error] => 
    [html] =>   Мои трудозатраты ч.ч (433.12 | 0 | 122.51)Общие затраты ч.ч (1030.12 | 5362)
)

I have ajax request:

$.ajax({
    url: '/project/event/events_work_time',
    type: 'POST',
    async: true,
    data: {},
    dataType: 'json',
    success: function(resp) {
        //var data = resp.upload;

        if(resp.error == false){
            $('#events_work_time').html(resp.html);

        }else{
            $('#events_work_time').html('Ошибка при загрузке');
        }

    }
});

But ajax answer is only

Мои трудозатраты ч.ч (433.12 | 0 | 0) <---This var is 0???

The last variable is 0. Why??? Can someone solve this?? I use kohana framework + twig

Thank to all that wanted to help. I solved it by myself. The problem was that ajax did not sent some data to php. Just added data parameter to ajax. And changed

$this->cur_project['id'] to $_POST['project_id']; in php

$.ajax({
    url: '/project/event/events_work_time',
    type: 'POST',
    async: true,
    data: {'project_id': "{{event}}"},
    dataType: 'json',
    success: function(resp) {
        //var data = resp.upload;

        if(resp.error == false){
            $('#events_work_time').html(resp.html);
        }else{
            $('#events_work_time').html('Ошибка при загрузке');
        }

    }
});