Update the current cart address error return to address step

[Giga_Boss]

Hello,

Currently in development of a module, I encounter a problem on version 1.7.

I wish to add a detail (according to certain criteria and actions of the user) in his address and only in the information of the current basket.

I therefore proceed as follows when choosing the carrier :

$address = new Address($params['cart']->id_address_delivery);
if( !empty($_POST['acr-choix']) )
{
	$address->other = htmlspecialchars($_POST['acr-choix']);
	$address->update();
}

The update works perfectly but on the other hand the function update() makes me immediately return to the stage of the choice of the address instead of continuing on the stage of payment.

Can you help me solve this problem ?

Thank you