[Python] Django - ValidationError "value must be an integer"

I was recycling some of my code from an old project (Django 1.7) to use it in a new one (Django 1.8), so I get this Error every time I want to Login



It was working well in Django 1.7

For my models I'm using an AbstractBaseUser

models.py

class Student(AbstractBaseUser, models.Model):
email = models.EmailField(max_length=50)
user_id = models.CharField(max_length=8, null=False, editable=False, default=id_generator, primary_key=True)
first_name = models.CharField(max_length=20)
last_name = models.CharField(max_length=20)
prom_code = models.CharField(max_length=8, null=False, default="")
gender = (("M","Male"),("F","Female"),)
gender = models.CharField(max_length=1, choices=gender, default="M", null=False)
USERNAME_FIELD = 'email'

@property
def is_superuser(self):
return False

def has_perm(self, perm, obj=None):
return False

def has_module_perms(self, app_label):
return False

@property
def is_staff(self):
return False

def save(self, **kwargs):
if not self.user_id:
self.user_id = id_generator()
while Student.objects.filter(user_id = self.user_id).exists():
self.user_id = id_generator()

super(Student, self).save()


I made a custom Authentication

auth_backend.py

from registration_app.models import Student
import md5


class ClientAuthBackend(object):

def authenticate(self, username=None, password=None):
try:
user = Student.objects.get(email=username)
password_ver = md5.new(password).hexdigest()
if user.check_password(password_ver):
return user
else:
print("Entre aqui")
return None
except Student.DoesNotExist:
print("Entre aqui2")
return None

def get_user(self, user_id):
try:
user = Student.objects.get(user_id=user_id)
if user is not None:
return user
except Student.DoesNotExist:
return None


views.py

def user_login(request):
args = {}
form = LoginForm(request.POST)
username = request.POST.get('email', '')
password = request.POST.get('password', '')
user = authenticate(username=username, password=password)

if user is not None:
print user.first_name + " ah iniciado session"
login(request, user) #-----**Here is where i get the problem**-----
return HttpResponseRedirect('/user/')
else:
print("El usuario no existe")

args['form'] = form
return render(request, 'user_student/login.html', args)


In my command prompt I can actually see the user getting logged in (it brings me the name of the user)

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