Delta migration error on "Url Rewrite Step"

I am trying to do a second delta migration.
The first one was successful, but the latter gives me an error in the "Url Rewrite Step" step. This is the mistake:

SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'magnum/champagne-436/champagne-serge-mathieu-cuvee-prestige-brut' for key 'URL_REWRITE_REQUEST_PATH_STORE_ID'

How can I solve the problem?

I am migrating from magento 1.9.2.4 to 2.3.4.