"Fatal Error" message when replying to a comment in Admin

[GoogleCodeExporter]

What steps will reproduce the problem?
1. In Admin, on Comments page OR Dashboard, hit the "Reply" button for a 
comment.
2. Type your reply and Submit.
3. Comment is added properly, but the following message is displayed:

Fatal error: Call to a member function save_settings() on a non-object in 
/home/example.com/public_html/wp-content/plugins/spam-karma/spam_karma_plugin.ph
p on line 958 

My setup has the WordPress files in public_html/wp, the content in 
public_html/wp-content, and the blog itself is at the site root example.com/.

Though it's purely visual (the comment submits just fine), it causes confusion, 
and the person might easily hit Submit multiple times before realizing the 
comments are submitting.

Original issue reported on code.google.com by stephen....@gmail.com on 25 Jun 2011 at 3:59

[GoogleCodeExporter]

Clarification to above report:  My install has the plugins at 
public_html/wp-content/plugins

Original comment by stephen....@gmail.com on 8 Sep 2011 at 9:06