AuthTokenSerializer cause Bad Gateway error

[gjae]

Checklist

• Raised initially as discussion #...
• This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.

The following code is my login view, i am using the default AuthTokenSerializer from rest_framework in the ObtainAuthToken base view

Code

class CreateUserAuthToken(ObtainAuthToken):
    def post(self, request, *args, **kwargs):
        serializer = self.serializer_class(
            data=request.data, context={"request": request}
        )

        serializer.is_valid(raise_exception=True) # here happens the issue
        print("USER VALIDATED") # Is not printed
        user = serializer.validated_data["user"]
        userSerializer = UserSerializer(user, many=False)
        token, created = Token.objects.get_or_create(user=user)
        return Response({"token": token.key, "user": userSerializer.data})

this return to client Bad gateway and cause unexpected EOF on client connection with an open transaction
waiterup_dev_django exited with code 247 in the postgresql server , then just restart django server.

Only happens with this route