Fatal error: Cannot access empty property in views_plugin_row_node_view.inc on line 95

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /admin/structure/views/view/timeline/preview/page/ajax
StatusText: OK
ResponseText:
Fatal error: Cannot access empty property in /sites/all/modules/views/modules/node/views_plugin_row_node_view.inc on line 95

This is likely to be a configuration error here but I've been unable to suss it out.