EntityMalformedException on Catalog Page

I don't know if this is a problem with my setup, or a bug with Ubercart.

On the catalog page, I get an EntityMalformedException. Tracking it down, I got to file uc_product/views/uc_product_handler_field_display_price.inc on line 30, in function get_value.

The issue is that the object given in $value is of a node that is not a product. For me, it's a random book page on my site. I tried deleting that page and recreating it, but the same thing happened.

So, when tries to find the product info for that node, it can't, so $nid is null.

So it seems that the issue is that the wrong node is being passed to this function. I don't have patience right now to backtrack further through the backtrace, but perhaps I will try tomorrow. This is what I have found for now, though.