Ticket #36639: 36639.2.patch

wp-includes/general-template.php

@@ -905 +905 @@
          * @since 4.5.0
          *
          * @param string $html Custom logo HTML output.
+         * @param int $blog_id ID of the blog in question. Default is the ID of the current blog.
          */
-        return apply_filters( 'get_custom_logo', $html );
+        $html = apply_filters( 'get_custom_logo', $html, $blog_id );
+
+        return $html;
 }
 
 /**