Error logged when visiting standard WP login with captcha plugin installed

I have installed the ReCaptcha plugin and entered the keys etc.

On visiting the standard WP login (not the UsersWP one) the following PHP error is logged:

[14-Nov-2019 17:02:50 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘UsersWP_Recaptcha’ does not have a method ‘add_scripts’ in ..\wp-includes\class-wp-hook.php on line 288

If I turn off the options to enable ReCaptcha on the WordPress Login Form and WordPress Registration Form the error goes away.

Hard to tell if ReCaptcha v3 is actually working on the standard login form but the error suggests it is not providing a valid callback so I would guess not.