These get logged when people use, and are probably not useful.
Undefined property: stdClass::$key in /data/project/citations/public_html/vendor/mediawiki/oauthclient/src/Client.php on line 181
Undefined property: stdClass::$secret in /data/project/citations/public_html/vendor/mediawiki/oauthclient/src/Client.php on line 181
I think that the code should probably handle these cases better.
Probably use "(string) @" in front of them.