diff --git a/test/functional/account_controller_test.rb b/test/functional/account_controller_test.rb
index 2a8c9c66b..1d66d01d3 100644
--- a/test/functional/account_controller_test.rb
+++ b/test/functional/account_controller_test.rb
@@ -67,6 +67,13 @@ class AccountControllerTest < ActionController::TestCase
     assert_redirected_to 'my/page'
   end
 
+  def test_login_with_invalid_openid_provider
+    Setting.self_registration = '0'
+    Setting.openid = '1'
+    post :login, :openid_url => 'http;//openid.example.com/good_user'
+    assert_redirected_to home_url
+  end
+  
   def test_login_with_openid_for_existing_non_active_user
     Setting.self_registration = '2'
     Setting.openid = '1'
diff --git a/vendor/plugins/open_id_authentication/lib/open_id_authentication.rb b/vendor/plugins/open_id_authentication/lib/open_id_authentication.rb
index 22481136e..70418fde7 100644
--- a/vendor/plugins/open_id_authentication/lib/open_id_authentication.rb
+++ b/vendor/plugins/open_id_authentication/lib/open_id_authentication.rb
@@ -89,7 +89,7 @@ module OpenIdAuthentication
 
       begin
         uri = URI.parse(identifier)
-        uri.scheme = uri.scheme.downcase  # URI should do this
+        uri.scheme = uri.scheme.downcase if uri.scheme # URI should do this
         identifier = uri.normalize.to_s
       rescue URI::InvalidURIError
         raise InvalidOpenId.new("#{identifier} is not an OpenID identifier")