wp_login – second parameter missing

Pie Register triggers the WordPress action wp_login at some points.

I’ve noticed that the action is called like this:
do_action( 'wp_login', $user->user_login )

This causes an error in other plugins (namely Protected Content by WPMU Dev), because the wp_login should be called with 2 parameters.

I suggest to update the plugin to call the hook like this:
do_action( 'wp_login', $user->user_login, $user )

According to the Codex:
codex.ww.wp.xz.cn/Plugin_API/Action_Reference/wp_login

This hook provides access to two parameters: $user->user_login (string) and $user ( WP_User )

https://ww.wp.xz.cn/plugins/pie-register/