django contrib auth last_login cannot be "null"

Hello,

I'm upgrading my systems to Django 1.8 and I'm facing this error:
(1048, "Column 'last_login' cannot be null")

so I describe my table in DB:
+---------------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default |
Extra |
+---------------------+------------------+------+-----+---------+----------------+
| last_login | datetime | NO | | NULL
| |


and yep, it is not nullable, but the 0005_alter_user_last_login_null
migrations
is run, so why this field is not nullable?
How can I debug this?

PS: I run ./manage.py migrate (without --fake option)
and I use the AbstractUser as my base class.

Thanks and have a good one

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