cannot use empty array elements in arrays

1'security' => array(
2			'allowed_ajax_actions' => array(
3				'Marker' => array(
4					'details' => true,
5					'save' => true,
6					'delete' => true
7				),
8				'Category' => array(
9					'index' => true
10				),
11				'Shape' => array(
12					'index' => true,
13					'add' => true,
14					'remove' => true
15				)
16			),
17			'salt' => 'sadaak#+jfo8qanishd2380§$Af#asU§Q(O§HQF3)§',
18			'cron_token_import' => 'a90ee59203d52c20807c1b84428d6e053be57b29',
19			'cron_token_calculate' => 'dwuofhz2389rhueiofh9782fhiuewfhwgoieus20'
20		),
21