Migration from to 2.3.5


I have done a clean migration from 1944 to 235 using the data migration tool.

The settings-migration is done, 100% no errors.

The data-migration is giving this error:

[2020-05-04 12:30:08][INFO][mode: data][stage: data migration][step: EAV Step]: started
42% [============>---------------] Remaining Time: 1 sec
In Mysql.php line 182:

  SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '10-design' for key 'EAV_ATTRIBUTE_GROUP_ATTR

As I have said, this is the first migration, thus a clean destination database.

Who can help me?