diff --git a/lib/noosfero/api/helpers.rb b/lib/noosfero/api/helpers.rb
index 16e0f55..275cc0f 100644
--- a/lib/noosfero/api/helpers.rb
+++ b/lib/noosfero/api/helpers.rb
@@ -412,7 +412,7 @@ require 'grape'
       ##########################################
 
       def test_captcha(remote_ip, params, environment)
-        captcha_plugin_enabled = @plugins.dispatch(:test_captcha, remote_ip, params, environment)
+        captcha_plugin_enabled = @plugins.dispatch(:test_captcha, remote_ip, params, environment).map {|p| p if ! ( p===nil ) }
         return true if captcha_plugin_enabled.size == 0
         if captcha_plugin_enabled.size > 1
           return render_api_error!(_("Error processing Captcha"), 500, nil, "More than one captcha plugin enabled")
diff --git a/lib/noosfero/plugin.rb b/lib/noosfero/plugin.rb
index ceb583a..db83f5a 100644
--- a/lib/noosfero/plugin.rb
+++ b/lib/noosfero/plugin.rb
@@ -671,6 +671,11 @@ class Noosfero::Plugin
     nil
   end
 
+  #By default will return nil that will mean not implented by the plugin
+  def test_captcha(*args)
+    nil
+  end
+
   # -> Adds additional blocks to profiles and environments.
   # Your plugin must implements a class method called 'extra_blocks'
   # that returns a hash with the following syntax.
--
libgit2 0.21.2