# Τεκμηρίωση του Django - 5.2.8

# Django 3.0.2 release notes

January 2, 2020

Django 3.0.2 fixes several bugs in 3.0.1.

## Bugfixes

- Fixed a regression in Django 3.0 that didn’t include columns referenced by a `Subquery()` in the `GROUP BY` clause (#31094).

- Fixed a regression in Django 3.0 where `QuerySet.exists()` crashed if a queryset contained an aggregation over a `Subquery()` (#31109).

- Fixed a regression in Django 3.0 that caused a migration crash on PostgreSQL 10+ when adding a foreign key and changing data in the same migration (#31106).

- Fixed a regression in Django 3.0 where loading fixtures crashed for models defining a `default` for the primary key (#31071).