Fixes: save() method for Order model fix

core/models.py

@@ -524,7 +524,10 @@ class Order(ExportModelOperationsMixin("order"), NiceModel):
         return self.attributes.get("is_business", False) if self.attributes else False
 
     def save(self, **kwargs):
-        if self.user.orders.filter(status="PENDING").count() > 1 and self.status == "PENDING":
+        pending_orders = 0
+        if self.user:
+            pending_orders = self.user.orders.filter(status="PENDING").count()
+        if self.status == "PENDING" and pending_orders > 1:
             raise ValueError(_("a user must have only one pending order at a time"))
         return super().save(**kwargs)
 
@@ -672,7 +675,6 @@ class Order(ExportModelOperationsMixin("order"), NiceModel):
             promocode_uuid: str | None = None,
             billing_address: str | None = None,
             shipping_address: str | None = None,
-            **kwargs,
     ) -> Self | Transaction | None:
         if config.DISABLED_COMMERCE:
             raise DisabledCommerceError(_("you can not buy at this moment, please try again in a few minutes"))