I have a problem with Django database. in model

I have specified that my bio and image fields can be empty, but why does it give me an error and say that I have to fill it in?

class User_account(models.Model):
    email = models.EmailField()
    fullname = models.CharField(max_length=30)
    username = models.CharField(max_length=20)
    password = models.CharField(max_length=30)
    marital_status = models.BooleanField(default=False)
    bio = models.CharField(null=True, max_length=200)
    visitor = models.IntegerField(default=0)
    image = models.ImageField(null=True, upload_to='profile_img')

>Solution :

Specifying null=True ^[Django-doc] does not mean the field is not required. null=True has only impact on the database: it makes the field NULLable. You should use blank=True ^[Django-doc] to make the field not required:

class User_account(models.Model):
    # …
    bio = models.CharField(null=True, blank=True, max_length=200)
    # …
    image = models.ImageField(null=True, blank=True, 

Note: Models in Django are written in PascalCase, not snake_case,
so you might want to rename the model from User_account to UserAccount.