django utils Integrity error

am adding class category in the models.py and adding it as a foreign key in the products model but i get this error while migrating

somebody, please help

here is the code

class Category(models.Model):
    name = models.CharField(max_length=50)

    def __str__(self):
        return self.name


class Product(models.Model):
    name = models.CharField(max_length=200)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    price = models.FloatField()
    digital = models.BooleanField(default=False, null=True, blank=True)
    image = models.ImageField(null=True, blank=True)

    def __str__(self):
        return self.name

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