I update php to 5.6.17 and exception stopped working.
Who know what happened?
example
try
{
    if ($Model->create($params->toArray()))
    {
        ...
    }
    else
    {
        throw new \Exception(implode('<br>', $Model->getMessages()));
    }
}
catch (\Exception $e)
{
    $this->flash->error($e->getMessage());
}os centos 6
on 1.3.4 work
on 2.0.9 not work