Get error "Handle has already been taken" when import csv file two times or more

[HvH]

I'm doing a feature by use bulkOperationRunMutation to import product via csv file. Everything ok in the first time but if i import a same file again, i get error Handle has already been taken even handle in csv file is blank

[JonasS]

Product handle should be unique in Shopify. So I think you should delete all the products you imported the first time. And then import product list again.
Generally, the handle is generated due to product title.

[HvH]

Yes, shopify not only auto generate handle from title but also can add number after it to unique handle

eg: if already "example-handle", shopify will generate "example-hanlde-1"

So I wonder why when import by csv via bulkOperationRunMutation in the second time, it seem shopify not work properly