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

models.py

class Club(models.Model):

league_names = models.ForeignKey(League, on_delete= models.CASCADE, related_name='club')

name = models.CharField(max_length=100)

logo = models.ImageField(upload_to='media/core', max_length=255, null=True, blank=True)

won = models.IntegerField()

draw = models.IntegerField()

lost = models.IntegerField()

goal_for = models.IntegerField()

goal_against = models.IntegerField()

club_position = models.IntegerField()

def CalcPoints(self):

return self.won*3 + self.draw

admin.py

class ClubAdmin(admin.ModelAdmin):

list_display = ['league_names', 'name', 'logo', 'won', 'draw', 'lost', 'total_points', 'goal_for', 'goal_against', 'goal_diff']

readonly_fields = ('total_points', 'goal_diff',)

admin.site.register(Club, ClubAdmin)

total_points = property(CalcPoints)

def GoalDiff(self):

return self.goal_for - self.goal_against

goal_diff = property(GoalDiff)

def __str__(self):

return self.name

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