errors when I turn context on

I am trying to get the left sidebar in my Danland theme to display just on the front page and on articles, blogs, and pages. So I made a context (attached). But when I turn it on, my articles and blogs have a bunch of these errors:
Notice: Trying to get property of non-object in node_page_title() (line 2206 of /home/kacbtn/keepandersoncountybeautiful.org/modules/node/node.module).

The errors disappear when I turn the context off.