Ich habe doch was entdeckt:
[29-Oct-2017 12:15:38 UTC] PHP Notice: Use of undefined constant full - assumed 'full' in /var/www/vhosts/foto-filme.de/httpdocs/wp-content/themes/ezio-qube/inc/template-tags.php on line 30
<h1 id="logo-pro"><?php global $post; if (get_theme_mod( 'qube_ezio_one_page_nav', 'off') == "off") : ?><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php else: ?><a href="#0" class="home-scroll-top" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php endif ?><?php if(is_page() && get_post_meta($post->ID, 'qube_ezio_custom_logo', true)): ?><?php $logo_pro = get_post_meta( get_the_id(), 'qube_ezio_custom_logo', false ); foreach ( $logo_pro as $single_logo_img ) ?><?php $logo_image = wp_get_attachment_image_src($single_logo_img, full); ?><img src="<?php echo esc_attr($logo_image[0]);?>" alt="<?php bloginfo('name'); ?>" width="<?php echo esc_attr(get_theme_mod( 'qube_ezio_theme_logo_width', '60' )); ?>" class="optional-logo" /><?php endif; ?><img src="<?php echo esc_attr(get_theme_mod( 'qube_ezio_theme_logo', get_template_directory_uri() . '/images/logo.png' )); ?>" alt="<?php bloginfo('name'); ?>" width="<?php echo esc_attr(get_theme_mod( 'qube_ezio_theme_logo_width', '60' )); ?>" class="default-logo" /></a></h1>