Notice: Undefined index: mtral_field_subscriber

Question

Notice: Undefined index: mtral_field_subscriber in /wp-content/plugins/redirect-after-login/redirect-after-login.php on line 54

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/redirect-after-login/redirect-after-login.php:54) in wp-includes/pluggable.php on line 1219

I get the above error and the error occurs specifically after I login since I am using Redirect After Login plugin in wordpress

How can I debug and fix it ?

Answer 1

You can simply remove that plugin, and create that redirection youself.

You can use the login_redirect hook, add this into your theme's functions.php

function redirect_admin( $redirect_to, $request, $user ){

    //is there a user to check?

    if ( isset( $user->roles ) && is_array( $user->roles ) ) {

        //check for admins
        if ( in_array( 'administrator', $user->roles ) ) {

            $redirect_to = get_site_url().'/a-page/'; // Your redirect URL
        }
    }

    return $redirect_to;
}

add_filter( 'login_redirect', 'redirect_admin', 10, 3 );

Answer 2

How can I debug and fix it ?

The issue is straightforward and the error identifies the specific file and line number that it's occurring on, but since this is a plugin it's something that the plugin author has to fix. You need to contact them and tell them to fix it or find another plugin.

That being said, a PHP notice like this is a minor issue, not something that should appear in production in front of the public. To prevent errors appearing to the public, in your wp-config.php file set WP_DEBUG_DISPLAY to false:

define('WP_DEBUG_DISPLAY', false);

But to keep a log of any errors, set WP_DEBUG_LOG to true:

define('WP_DEBUG_LOG', true);