Fatal error: Exception thrown without a stack frame in Unknown on line 0

[barat]

This sample code is causing error like in title of this issue:

$demo = array('label'=>'FirePHP Table...',
          'table' => array(
                array('Col 1 Heading', 'Col 2 Heading'),
                array('Row 1 Col 1', 'Row 1 Col 2'),
                array('Row 2 Col 1', 'Row 2 Col 2'),
                array('Row 3 Col 1', 'Row 3 Col 2')
                   ));

Kohana::$log->add('FirePHP::LOG', array('label' => 'Passing objects to log...',
                    'object' => $demo));

It's just copy&paste from example bootstrap