How to fix this PHP warning in WP-Admin after upgrading to 3.1.2?

The “Comments” column is not a default/core column in the “Posts” page. Perhaps it is being generated by your Disqus Plugin?

Try temporarily disabling the Disqus Plugin, and see if the PHP notices go away.

EDIT: actually, it is a default column. But I still suspect Disqus is causing the PHP warning.

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