diff --git a/lms/djangoapps/lti_provider/models.py b/lms/djangoapps/lti_provider/models.py
index 61c024a107..dc5305bfe5 100644
--- a/lms/djangoapps/lti_provider/models.py
+++ b/lms/djangoapps/lti_provider/models.py
@@ -26,7 +26,7 @@ class LtiConsumer(models.Model):
     consumer_name = models.CharField(max_length=255, unique=True)
     consumer_key = models.CharField(max_length=32, unique=True, db_index=True)
     consumer_secret = models.CharField(max_length=32, unique=True)
-    instance_guid = models.CharField(max_length=255, null=True, unique=True)
+    instance_guid = models.CharField(max_length=255, blank=True, null=True, unique=True)
 
     @staticmethod
     def get_or_supplement(instance_guid, consumer_key):