IntegrityError: null value in column "user_id" violates not-null constraint

I'm trying to save image in postgres database. I have upload model which has a foreign key reference to the extended custom user model. But it shows the following error

uploads/model.py

from django.db import models
from django.contrib.auth import get_user_model

User = get_user_model()

class Upload(models.Model):
    upload_file = models.ImageField(upload_to='uploads/')
    upload_date = models.DateTimeField(auto_now_add =True)
    user = models.ForeignKey(User, on_delete=models.CASCADE)

What am I missing? Thanks in advance

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