PHP warning when unvalidate user try to reset password

Hey,

I’m working with WP-Members plugin for create a website with restricted content for logged users only. I use different form (register, login, reset password and forgot username). On each new registration, the user must be activated and confirmed for receive a password by email.

For security reasons, I tested every comportment and situations can be appear on my forms. I spotted an error on the reset password form. When a user unconfirmed or unvalidated type his username, php warnings appears :

Undefined array key "acct_not_approved"
Undefined array key "acct_not_validated"

I searching how to resolve this situation by hidden theses warnings and displaying a custom error message for significated to the user that is accounti isn’t approved / confirmed but I don’t find the solution.

However, when user type an unknow username, everything works and wp-members diplaying an error message for inform user that the username doesn’t exist.
When the username exist, the user receive an email normally and he can change his password.