Help for Aimeos

Thanks!

Hello, I need to get the stock value of a product and I'm using the getStockItems function, but I have no results. My code looks like this:

$newfunction = function( \Aimeos\MShop\Product\Item\Iface $item ) use ( $fields, $target, $cntl, $action, $config ){
var_dump($item->getStockItems( ));
die ...