WPSEO_Frontend not found on version 17.8

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We were using the WPSEO_Frontend class to get the title of the current page and then use it to feed some share buttons, like this:

$wpseo = WPSEO_Frontend::get_instance();
$current_title = $wpseo->title( false );

When updating to 17.8 we get a fatal error:

HP Fatal error: Uncaught Error: Class ‘WPSEO_Frontend’ not found in…

What is now the alternative to get the current page title from Yoast SEO?