diff --git a/utils/models.py b/utils/models.py
index e70dea5c..3bf5020f 100644
--- a/utils/models.py
+++ b/utils/models.py
@@ -13,7 +13,7 @@ class BaseBillingAddress(models.Model):
     city = models.CharField(max_length=50)
     postal_code = models.CharField(max_length=50)
     country = CountryField()
-    vat_number = models.CharField(max_length=100)
+    vat_number = models.CharField(max_length=100, default="")
 
     class Meta:
         abstract = True