Can't save a discussion edited on backend

I get this when I edit any discussion on the backend, and click "save" (or even not editing, and just clicking save):

Warning: Creating default object from empty value in (path)/administrator/components/com_finder/helpers/indexer/adapter.php on line 560

Catchable fatal error: Argument 1 passed to plgFinderEasyDiscuss::index() must be an instance of FinderIndexerResult, instance of stdClass given, called in (path)/administrator/components/com_finder/helpers/indexer/adapter.php on line 333 and defined in (path)/plugins/finder/easydiscuss/easydiscuss.php on line 103

(path) is the full path on my system. Using latest version of EasyDiscuss. Any ideas?