Is it the plugin or Last.fm?

“Catchable fatal error: Object of class stdClass could not be converted to string in /home/content/j/e/n/jennyjenjen/html/blog/wp-content/plugins/lastfm-rps/lastfm.php on line 190” appears in the widget sidebar on public site. Wondering if it’s last.fm’s problem and not the widget as last.fm has had issues lately. Any thoughts or fixes?