Problem with custom field produtcs!

-- HikaShop version -- : HikaShop Business: 4.0.2
-- Joomla version -- : Joomla! 3.9.3
-- PHP version -- : 7.2.13
-- Error-message(debug-mod must be tuned on) -- : The field "link_esterno" already exists in the table "product"


Hello. I made a custom field for a product. After saving it I realized that I had made some mistakes so I had to delete it. Now I would like to recreate it with the same name, but this message comes out "The field "link_esterno" already exists in the table "product". But I checked It and I don't have it in the Table Product. Thanks for your Help!

Thanks Nicolas. Have a nice day!