diff --git a/edx_exams/apps/core/migrations/0019_alter_user_full_name.py b/edx_exams/apps/core/migrations/0019_alter_user_full_name.py
new file mode 100644
index 00000000..44194acf
--- /dev/null
+++ b/edx_exams/apps/core/migrations/0019_alter_user_full_name.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.21 on 2023-10-02 20:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0018_staff_roles'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='full_name',
+            field=models.CharField(blank=True, default='', max_length=255, verbose_name='Full Name'),
+        ),
+    ]
diff --git a/edx_exams/apps/core/models.py b/edx_exams/apps/core/models.py
index d3e1df5a..7478f7a5 100644
--- a/edx_exams/apps/core/models.py
+++ b/edx_exams/apps/core/models.py
@@ -24,7 +24,8 @@ class User(AbstractUser):
     .. pii_retirement: local_api
 
     """
-    full_name = models.CharField(_('Full Name'), max_length=255, blank=True, null=True)
+    # The default empty string was added to change full_name from nullable to non-nullable.
+    full_name = models.CharField(_('Full Name'), max_length=255, blank=True, default='')
 
     lms_user_id = models.IntegerField(null=True, db_index=True)
 
diff --git a/edx_exams/apps/core/tests/test_models.py b/edx_exams/apps/core/tests/test_models.py
index b3563f4f..d509d996 100644
--- a/edx_exams/apps/core/tests/test_models.py
+++ b/edx_exams/apps/core/tests/test_models.py
@@ -31,7 +31,7 @@ def test_get_full_name(self):
 
         first_name = 'Jerry'
         last_name = 'Seinfeld'
-        user = G(User, full_name=None, first_name=first_name, last_name=last_name)
+        user = G(User, first_name=first_name, last_name=last_name)
         expected = '{first_name} {last_name}'.format(first_name=first_name, last_name=last_name)
         self.assertEqual(user.get_full_name(), expected)