diff --git a/CHANGES.txt b/CHANGES.txt
index 885b89f..aa2da65 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,12 +1,17 @@
 Changelog
 =========
 
-1.0b6 (unreleased)
+1.0b6 (2010-08-05)
 ------------------
 
 * Catch Type errors in indexers if object can not be adapted to IDiscussion
   [do3cc]
 
+* Call the CaptchaValidator even when no captcha data was submitted. This is 
+  necessary to ensure that the collective.akismet validator is called when installed. 
+  [timo]
+
+
 1.0b5 (2010-07-16)
 ------------------
 
diff --git a/plone/app/discussion/browser/comments.py b/plone/app/discussion/browser/comments.py
index 1a9f38a..e2494fb 100644
--- a/plone/app/discussion/browser/comments.py
+++ b/plone/app/discussion/browser/comments.py
@@ -111,17 +111,14 @@ class CommentForm(extensible.ExtensibleForm, form.Form):
         settings = registry.forInterface(IDiscussionSettings)
         portal_membership = getToolByName(self.context, 'portal_membership')
         if settings.captcha != 'disabled' and portal_membership.isAnonymousUser():
-            if 'captcha' in data:
-                # Check Captcha only if there is a value, otherwise
-                # the default "required" validator is sufficient.
-                captcha = CaptchaValidator(self.context, 
-                                           self.request, 
-                                           None, 
-                                           ICaptcha['captcha'], 
-                                           None)
-                captcha.validate(data['captcha'])
-            else:
-                return
+            if not 'captcha' in data:
+                data['captcha'] = u""
+            captcha = CaptchaValidator(self.context, 
+                                       self.request, 
+                                       None, 
+                                       ICaptcha['captcha'], 
+                                       None)
+            captcha.validate(data['captcha'])
 
         if 'title' in data:
             title = data['title']