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Notice (8): Undefined offset: 0 [APP/Controller/GemstonesController.php, line 1291]

            $stonesArr    =    $this->StoneAlias->find('all', array('conditions' => array('stone_name <>' => '', 'Stone.published' => 1, 'page_url' => $stone ), 'fields' => array( 'StoneAlias.stone_name_alias', 'Stone.stone_name')) );
            $stones    =    Set::Extract('{n}/StoneAlias/stone_name_alias', $stonesArr);            
            $stone_name    =    $stonesArr[0]['Stone']['stone_name'];

$stone = 'dendrite-opal'
$st_name = 'dendrite-opal'
$categories = 'sets'
$st_cat = 'sets'
$filter = ''
$size_filter = ''
$stone_page_url = 'dendrite-opal'
$stone_name = 'dendrite-opal'
$category = 'set'
$category_name = 'Sets'
$available_categories = array(
	(int) 0 => 'express_shippings',
	(int) 1 => 'necklaces',
	(int) 2 => 'bracelets',
	(int) 3 => 'pendants',
	(int) 4 => 'trending_gifts',
	(int) 5 => 'bangles',
	(int) 6 => 'rattles',
	(int) 7 => 'cufflinks',
	(int) 8 => 'earrings',
	(int) 9 => 'mixeds',
	(int) 10 => 'sets',
	(int) 11 => 'rings',
	(int) 12 => 'chains',
	(int) 13 => 'beads'
)
$exclusive_products = array()
$stones = array()
$stonesArr = array()

GemstonesController::jewelry_category() - APP/Controller/GemstonesController.php, line 1291
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 490
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 185
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 160
[main] - APP/webroot/index.php, line 108