Error using Django 1.9 with Postgres

Hello,

I`m start to using Django 1.9 with PostgreSQL, and when I try to add a record  using Admin, show me these error:

IntegrityError at /admin/cadastro/mercadoria/add/

insert or update on table "django_admin_log" violates foreign key constraint "django_admin_log_user_id_c564eba6_fk_accounts_webconflexuser_id"

DETAIL:  Key (user_id)=(1) is not present in table "accounts_webconflexuser".

Here is my traceback [1]

I`m using a custom user model. And yes! I have a admin user and logged with them...

Any ideia what's going on?

[1] - http://pastebin.com/2LAhmd40

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