diff --git a/bagdiscovery/migrations/0003_auto_20200127_1819.py b/bagdiscovery/migrations/0003_auto_20200127_1819.py
new file mode 100644
index 0000000..5034764
--- /dev/null
+++ b/bagdiscovery/migrations/0003_auto_20200127_1819.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.2.8 on 2020-01-27 18:19
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bagdiscovery', '0002_auto_20181119_1527'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='bag',
+            name='accession',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='bagdiscovery.Accession'),
+        ),
+    ]
diff --git a/bagdiscovery/models.py b/bagdiscovery/models.py
index cbd62d1..9532564 100644
--- a/bagdiscovery/models.py
+++ b/bagdiscovery/models.py
@@ -11,7 +11,7 @@ class Accession(models.Model):
 class Bag(models.Model):
     bag_identifier = models.CharField(max_length=255, unique=True)
     bag_path = models.CharField(max_length=255, null=True, blank=True)
-    accession = models.ForeignKey(Accession, on_delete=models.CASCADE)
+    accession = models.ForeignKey(Accession, on_delete=models.CASCADE, null=True, blank=True)
     data = JSONField(null=True, blank=True)
     created = models.DateTimeField(auto_now=True)
     last_modified = models.DateTimeField(auto_now_add=True)