Thanks! Fixes the issue in the spam case. We had reports that there are AJAX-errors without something beeing rejected by Akismet, but we were not able to reproduce the errors up to now.
Perhaps interesting for you as plugin-author: We are using the plugin for making accessible and commentable conference proceedings for an eLearning-conference starting next week: https://2014.gmw-online.de The conference proceedings were available 4 week before the conference start.