IntegrityError FOREIGN KEY constraint failed - пользовательская модель пользователя Django

Я новичок в создании пользовательских моделей пользователей в Django, так что потерпите меня.

Моя проблема в том, что я получаю IntegrityError at /admin/accounts/customuser/add/ FOREIGN KEY constraint failed при удалении пользователя в Django admin. Это также происходит, когда я пытаюсь добавить пользователя в Django admin.

Код

models.py

from django.contrib.auth.models import AbstractUser, BaseUserManager
from django.db import models
from django.utils.translation import gettext_lazy as _


class UserManager(BaseUserManager):
    def _create_user(self, email, password, **kwargs):
        if not email:
            raise ValueError("Email is required")

        email = self.normalize_email(email)
        user = self.model(email=email, **kwargs)
        user.set_password(password)
        user.save()
        return user

    def create_user(self, email, password=None, **extra_fields):
        """Create and save a regular User with the given email and     password."""
        extra_fields.setdefault('is_staff', False)
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password, **kwargs):
        kwargs.setdefault('is_staff', True)
        kwargs.setdefault('is_superuser', True)
        kwargs.setdefault('is_active', True)

        if kwargs.get('is_staff') is not True:
            raise ValueError("Superuser must have is_staff True")
        if kwargs.get('is_superuser') is not True:
            raise ValueError("Superuser must have is_superuser True")
        return self._create_user(email, password, **kwargs)

class CustomUser(AbstractUser):
    username = None
    first_name = None
    last_name = None
    email = models.EmailField(_('email address'), blank=False, null=False, unique=True)
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []
    full_name = models.CharField(_('full name'), max_length=1000, null=True, blank=True)
    user_id = models.CharField(_('session id'), max_length=10000, null=True, blank=True)
    verification_code_time = models.IntegerField(_('time left for session id'), null=True, blank=True)
    verification_code = models.IntegerField(_('verification code'), null=True, blank=True)
    objects = UserManager()

    def __str__(self):
        return self.email

admin.py

from django.contrib import admin
from .models import CustomUser

admin.site.register(CustomUser)

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