Low Stock Fatal error

I have noticed after deleting some products down to 819, on my wordpress dashboard it still says I have 856 ( as low in stock, I have one product per product published so it says low in stock for every product ). When I click on it I get a fatal error message:

Fatal error: Uncaught Error: Call to a member function get_id()

I don’t know if its okay to post the whole error or not but that is the beginning of it. Any help would be appreciated, thanks