diff --git a/refstack/api/controllers/products.py b/refstack/api/controllers/products.py
index 08194733..9d054862 100644
--- a/refstack/api/controllers/products.py
+++ b/refstack/api/controllers/products.py
@@ -115,6 +115,15 @@ class VersionsController(validation.BaseRestControllerWithValidation):
 
             pecan.abort(403, 'Forbidden.')
         try:
+            version = db.get_product_version(version_id,
+                                             allowed_keys=['version'])
+            if not version['version']:
+                pecan.abort(400, 'Can not delete the empty version as it is '
+                                 'used for basic product/test association. '
+                                 'This version was implicitly created with '
+                                 'the product, and so it cannot be deleted '
+                                 'explicitly.')
+
             db.delete_product_version(version_id)
         except DBReferenceError:
             pecan.abort(400, 'Unable to delete. There are still tests '
diff --git a/refstack/tests/api/test_products.py b/refstack/tests/api/test_products.py
index 1ccca172..51906776 100644
--- a/refstack/tests/api/test_products.py
+++ b/refstack/tests/api/test_products.py
@@ -284,3 +284,9 @@ class TestProductVersionEndpoint(api.FunctionalTest):
         self.delete(self.URL + version_id)
         self.assertRaises(webtest.app.AppError, self.get_json,
                           self.URL + 'version_id')
+
+        # Get the null version and ensure it can't be deleted.
+        versions = self.get_json(self.URL)
+        version_id = versions[0]['id']
+        response = self.delete(self.URL + version_id, expect_errors=True)
+        self.assertEqual(400, response.status_code)