diff --git a/src/core/models.py b/src/core/models.py
index 1141f51..fcbcf53 100644
--- a/src/core/models.py
+++ b/src/core/models.py
@@ -190,21 +190,21 @@ class Order(models.Model):
         related_name="+",
         editable=False,
         null=True,
-        on_delete=models.SET_NULL,
+        on_delete=models.SET_NULL
     )
     shipping_address = models.ForeignKey(
         Address,
         related_name="+",
         editable=False,
         null=True,
-        on_delete=models.SET_NULL,
+        on_delete=models.SET_NULL
     )
     shipping_method = models.ForeignKey(
         ShippingMethod,
         blank=True,
         null=True,
         related_name="orders",
-        on_delete=models.SET_NULL,
+        on_delete=models.SET_NULL
     )
 
 
@@ -212,6 +212,7 @@ class Order(models.Model):
         Coupon,
         related_name='orders',
         on_delete=models.SET_NULL,
+        blank=True,
         null=True
     )
 
@@ -224,7 +225,7 @@ class Order(models.Model):
     total_net_amount = models.DecimalField(
         max_digits=10,
         decimal_places=2,
-        default=0,
+        default=0
     )
 
 
@@ -232,6 +233,8 @@ class Order(models.Model):
         measurement=Weight,
         unit_choices=WeightUnits.CHOICES,
         default=zero_weight,
+        blank=True,
+        null=True
     )
 
     created_at = models.DateTimeField(auto_now_add=True, editable=False)