Error on order list

Hi,

Sorry for me posting multiple issues today, but your module is something i really want on my website so im just helping you fixing some bugs :) Dont take it personal ;)

On the admin/store/orders/1 page, i get the following order:

warning: Invalid argument supplied for foreach() in F:\Websites\alanya\sites\all\modules\uc_deliveryslot_postcode\uc_deliveryslot_postcode.module on line 372.