Notice: Undefined index: author_names in /usr/share/nginx/html/parisreview.org/parisreview_2016/app/src/models/issuemodel.php on line 241

Catchable fatal error: Argument 1 passed to AppUtils::natural_language_join() must be of the type array, null given, called in /usr/share/nginx/html/parisreview.org/parisreview_2016/app/src/models/issuemodel.php on line 241 and defined in /usr/share/nginx/html/parisreview.org/parisreview_2016/app/src/app_utils.php on line 296