diff --git a/app/models/user.rb b/app/models/user.rb
index a825864ed..b56064e9b 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -195,7 +195,7 @@ class User
       person.save  
 
     elsif object.is_a?(Comment) 
-      raise "Signature was not valid on: #{object.inspect}" unless post.person == self || object.verify_post_creator_signature
+      raise "Signature was not valid on: #{object.inspect}" unless object.post.person == self || object.verify_post_creator_signature
       dispatch_comment object unless owns?(object)
       object.socket_to_uid(id)  if (object.respond_to?(:socket_to_uid) && !self.owns?(object))
     else