diff --git a/smash/web/models.py b/smash/web/models.py
index 0a96b6f6914328031426890d03adab515adbe7d7..4351c5a663af37ef7ff4b27cdf85e1496eac16c6 100644
--- a/smash/web/models.py
+++ b/smash/web/models.py
@@ -362,7 +362,8 @@ class Appointment(models.Model):
         verbose_name='Visit ID'
     )
     datetime_when = models.DateTimeField(
-        verbose_name='Appointment on'
+        verbose_name='Appointment on',
+        null=True
     )
     length = models.IntegerField(
         verbose_name='Appointment length (in minutes)'