diff --git a/app/core/models.py b/app/core/models.py
index 06f621e..8d56a93 100644
--- a/app/core/models.py
+++ b/app/core/models.py
@@ -13,6 +13,8 @@ class UserManager(BaseUserManager):
     """Manager for users."""
 
     def create_user(self, email, password=None, **extra_fields):
+        if not email:
+            raise ValueError('User must have an email address.')
         user = self.model(email=self.normalize_email(email), **extra_fields)
         user.set_password(password)
         user.save(using=self._db)
diff --git a/app/core/tests/test_models.py b/app/core/tests/test_models.py
index 57245e2..75d6ad1 100644
--- a/app/core/tests/test_models.py
+++ b/app/core/tests/test_models.py
@@ -25,3 +25,7 @@ def test_new_user_email_normalized(self):
         for email, expected in sample_emails:
             user = get_user_model().objects.create_user(email, 'sample123')
             self.assertEqual(user.email, expected)
+
+    def test_new_user_without_email_raises_error(self):
+        with self.assertRaises(ValueError):
+            get_user_model().objects.create_user('', 'sample123')