wp-login.php shows error message (wrong username …)

Hey folks,

there is a strange behavior using this plugin and opening the wp-login.php page.
As soon as I activate the plugin and open the wp-loging.php page (being logout out) an error message “Error: Wrong username or email…” shows up.

This kind of error message normally shows up, after trying to log in with invalids user credentials.

Any ideas?

Thanks in advance!

https://ww.wp.xz.cn/plugins/google-authenticator/