Something is causing an error on some of my EasyBlog pages

Do you have any idea what could be causing the error on this site to make the EasyBlog theme not display. I am assuming a plugin or module may be having a conflict. But, I thought you would like to see this.

My joomla access for this site is the same as for my drcarney.com site as this is just a temporary copy of drcarney.com which I hope to replace the existing site with as soon as I resolve a couple bugs.

Here is one of the pages that you can see the problem on: http://drc.cloudaccess.host/gems

It is not happening on all my pages though. Very interesting.

I did turn on the joomla debugger and got the following:

0 - Call to undefined method stdClass::getAuthor()

Call stack
# Function Location
1 JApplicationCms->execute() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/index.php:49
2 JApplicationSite->doExecute() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/libraries/cms/application/cms.php:261
3 JApplicationSite->dispatch() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/libraries/cms/application/site.php:230
4 JComponentHelper::renderComponent() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/libraries/cms/application/site.php:191
5 JComponentHelper::executeComponent() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/libraries/cms/component/helper.php:380
6 require_once() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/libraries/cms/component/helper.php:405
7 JControllerLegacy->execute() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/components/com_easyblog/easyblog.php:43
8 EasyBlogController->display() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/libraries/legacy/controller/legacy.php:702
9 EasyBlogViewCategories->listings() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/components/com_easyblog/controllers/controller.php:107
10 EasyBlogView->display() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/components/com_easyblog/views/categories/view.html.php:258
11 EasyBlogThemes->output() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/components/com_easyblog/views/views.php:164
12 include() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/administrator/components/com_easyblog/includes/themes/themes.php:447
13 EasyBlogThemes->output() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/components/com_easyblog/themes/nickel/blogs/categories/item.php:106
14 include() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/administrator/components/com_easyblog/includes/themes/themes.php:447
15 EasyBlogThemes->output() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/components/com_easyblog/themes/nickel/blogs/latest/default.main.php:216
16 include() /mnt/data/vhosts/http://casite-686358.cloudaccess.net/httpdocs/administrator/components/com_easyblog/includes/themes/themes.php:447