unsuppoted operand type(s) for *: ‘NoneType’ and ‘NoneType’

Helo everyone, am trying to compute unit price and the quantity from this table as follows

class Marketers(models.Model):
    category =models.ForeignKey(Category, on_delete=models.CASCADE, null=True)
    name =models.CharField(max_length=50, null=True, blank =True)
    grade =models.CharField(max_length=50, null=True, blank =True)
    quatity_received = models.IntegerField(default=0, null=True, blank =True)
    unit_price =models.IntegerField(default=0, null=True, blank =True)
    customer = models.CharField(max_length=50, null=True, blank =True)
    date_received = models.DateTimeField(auto_now_add=True)
    date_sold = models.DateTimeField(auto_now_add=True)

    def get_total(self):
        total = self.quatity_received * self.unit_price
        return total

this is how i call it in my template

<td class="align-middle text-center">
  <span class="text-secondary text-xs font-weight-bold"> list.get_total </span>
  <p class="text-xs text-secondary mb-0">Overall Price </p>

this is the erro am receiving

TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'

please i need help. Thanks

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