Fix manage check errors

1 files changed, 7 insertions, 2 deletions

diff --git a/servo/models/invoices.py b/servo/models/invoices.py
index cbcbd66..3aa1d25 100644
--- a/servo/models/invoices.py
+++ b/servo/models/invoices.py
@@ -14,7 +14,10 @@ from servo.models import (User, Customer, Order, Location,
 
 class Invoice(models.Model):
     created_at = models.DateTimeField(editable=False, auto_now_add=True)
-    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, editable=False, on_delete=models.SET_NULL)
+    created_by = models.ForeignKey(settings.AUTH_USER_MODEL,
+        null=True,
+        editable=False,
+        on_delete=models.SET_NULL)
 
     PAYMENT_METHODS = (
         (0, _("No Charge")),
@@ -184,7 +187,9 @@ class Payment(models.Model):
         default=METHODS[0][0],
         verbose_name=_("Payment Method")
     )
-    created_by = models.ForeignKey(User, on_delete=models.SET_NULL)
+    created_by = models.ForeignKey(User,
+        null=True,
+        on_delete=models.SET_NULL)
     created_at = models.DateTimeField(auto_now_add=True)
     amount = models.DecimalField(max_digits=8, decimal_places=2)