Warning: Invalid argument supplied for foreach() in /home/onelov7/public_html/components/com_k2/models/item.php on line 1594

I got this message error on the top of every K2 Item published. I have checked the file item.php and that line doesn't even exist. Can anyone help me?

oneloverolling.com/index.php/component/k2/item/245-premios-action-2014-nominados

Thanks

I am using Joomla 2.5.9 and K2 2.6.7

Do you use attachments in your items?