Why am I getting "..Undefined Index…" Messages?

hmm yep I was able to recreate the php error messages by setting WP_DEBUG_DISPLAY to true in my wp-config.php file. WP_DEBUG should only be used when you are debugging things and should not remain turned on at all times. Doing that will cause major website performance problems. So for now turn off WP Debugging after you are done debugging things. In the long run we will suppress the php errors from occurring since they are insignificant and do not cause any issues/problems.

define('WP_DEBUG', false);
define('WP_DEBUG_LOG', false);
define('WP_DEBUG_DISPLAY', false);

Or if you feel like suppressing the php errors now then do these steps:

1. Open and edit this BPS plugin file: /bulletproof-security/admin/includes/admin.php.
2. Add an @ symbol in front of all of these lines of code shown below to suppress the php errors.

// Idle Session Logout (ISL): Do not automatically set ISL up. This should be left up to users to choose whether to use this or not.
function bulletproof_security_options_validate_idle_session($input) {
	$options = get_option('bulletproof_security_options_idle_session');
	$options['bps_isl'] = wp_filter_nohtml_kses($input['bps_isl']);
	$options['bps_isl_timeout'] = trim(wp_filter_nohtml_kses($input['bps_isl_timeout']));
	$options['bps_isl_login_url'] = trim(wp_filter_nohtml_kses($input['bps_isl_login_url']));
	$options['bps_isl_user_account_exceptions'] = wp_filter_nohtml_kses($input['bps_isl_user_account_exceptions']);
	@$options['bps_isl_administrator'] = wp_filter_nohtml_kses($input['bps_isl_administrator']);
	@$options['bps_isl_editor'] = wp_filter_nohtml_kses($input['bps_isl_editor']);
	@$options['bps_isl_author'] = wp_filter_nohtml_kses($input['bps_isl_author']);
	@$options['bps_isl_contributor'] = wp_filter_nohtml_kses($input['bps_isl_contributor']);
	@$options['bps_isl_subscriber'] = wp_filter_nohtml_kses($input['bps_isl_subscriber']);
	@$options['bps_isl_tinymce'] = wp_filter_nohtml_kses($input['bps_isl_tinymce']);

	return $options;
}

// Authentication Cookie Expiration (ACE): Do not automatically set ACE up. This should be left up to users to choose whether to use this or not.
function bulletproof_security_options_validate_auth_cookie($input) {
	$options = get_option('bulletproof_security_options_auth_cookie');
	$options['bps_ace'] = wp_filter_nohtml_kses($input['bps_ace']);
	$options['bps_ace_expiration'] = trim(wp_filter_nohtml_kses($input['bps_ace_expiration']));
	$options['bps_ace_rememberme_expiration'] = trim(wp_filter_nohtml_kses($input['bps_ace_rememberme_expiration']));
	$options['bps_ace_user_account_exceptions'] = wp_filter_nohtml_kses($input['bps_ace_user_account_exceptions']);
	@$options['bps_ace_administrator'] = wp_filter_nohtml_kses($input['bps_ace_administrator']);
	@$options['bps_ace_editor'] = wp_filter_nohtml_kses($input['bps_ace_editor']);
	@$options['bps_ace_author'] = wp_filter_nohtml_kses($input['bps_ace_author']);
	@$options['bps_ace_contributor'] = wp_filter_nohtml_kses($input['bps_ace_contributor']);
	@$options['bps_ace_subscriber'] = wp_filter_nohtml_kses($input['bps_ace_subscriber']);

	return $options;
}

Thanks.
I used the first suggestion, and that solved the problem.

I found I didn’t have the second and third items in my wp-config.php file. So I added them and set them to false.

Thanks for the help.