don’t call ajax if not plugin page

You can check for WordPress’s DOING_AJAX constant:

if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
    return;
}

…or use the related wp_doing_ajax() function:

if ( wp_doing_ajax() ) {
    return;
}

However, I’d also double-check to make sure that App\Bootstrap has a method named process_moviewp_like as well, because that error doesn’t look like something that would be limited to AJAX.