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Issue after PHP Update higher 7.4

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The support doesn work on Saturdays and Sundays, so some Friday requests can be answered on Monday.

Hello, the following error appears when updating the PHP version to 8.* from the website.
Warning: Undefined array key"swoof" in /www/htdocs/w01bbfe0/shop.zwi****/wp-content/themes/molla-child/functions.php

the code reads:
add_filter( 'wpseo_title', 'custom_title', 15 );
function custom_title( $title ) {
if ( $_GET['swoof'] && $_GET['pa_brand'] && is_archive() ) {
return filter_var( $_GET['pa_brand'], FILTER_SANITIZE_STRING ) . ' - ' . get_bloginfo();
}
}

Is it possible that this is no longer supported?

We are using Woocommerce Products Filter

Hello

This is your custom code. You should write to the developer who did this for you

In this third party code you should add a check for the existence of this value  isset($_GET['swoof'])