Ticket #27935: option.php.patch

wp-includes/option.php

@@ -967 +967 @@
                         $row = $wpdb->get_row( $wpdb->prepare("SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) );
 
                         // Has to be get_row instead of get_var because of funkiness with 0, false, null values
-                        if ( is_object( $row ) ) {
+                        if ( is_object( $row ) && $row->meta_value !== '' ) {
                                 $value = $row->meta_value;
                                 $value = maybe_unserialize( $value );
                                 wp_cache_set( $cache_key, $value, 'site-options' );