Going into the PhpMyAdmin --> products database and deleting the item there did the trick! We still don't know why it happens, but at least can remove them now. Thank you all!
Going into the PhpMyAdmin --> products database and deleting the item there did the trick! We still don't know why it happens, but at least can remove them now. Thank you all!
I didn't find my notes yet but I think it happens when using the products to categories. I am guessing that I might have deleted the master category and didn't assign a new one. So it was left in the products to categories? I still need to test this theory. To find them all you could run an SQL that looks for all products in products to category without a match in products.