As the site administrator, when I submit a comment, I get the following error:
Fatal error: Call to undefined function is_blog_admin() in /home/sites/cyprus-property-buyers.com/public_html/wp/wp-content/plugins/quick-cache/includes/classes/utils-conds.inc.php on line 37
However, the comment is submitted correctly and displays.
This problem does not affect visitors to my site making comments; these are fine.
Any thoughts as to what might be causing this?