Breadcrumbs error – missing item or item.name

Our client just got an email saying that every article (regular post) is returning the error in the subject.

After a bit of digging, I notice that in the schema the last page is outputted twice the last one in the chain is ok but the one before him his the duplicate and he has a name property with the value of null.

The page I need help with: [log in to see the link]