Directory plugin error

The listings page generates the following error and does not display any information.

Notice: Undefined index: dr_random_value in /home3/bhsmileh/public_html/wpv1/wp-content/plugins/directory/core/core.php on line 1278

The listings-category pages also show the following error
Notice: Undefined index: dr_random_value in /home3/bhsmileh/public_html/wpv1/wp-content/plugins/directory/core/core.php on line 1278

Notice: Trying to get property of non-object in /home3/bhsmileh/public_html/wpv1/wp-includes/post-template.php on line 1275

Notice: Undefined property: stdClass::$post_name in /home3/bhsmileh/public_html/wpv1/wp-includes/template.php on line 244

I have reproduced the error with several themes.