Ticket #20249: theme.php.patch

wp-includes/theme.php

@@ -1441 +1441 @@
                 add_theme_support( 'custom-background', array( '__jit' => true ) );
 
                 $args = get_theme_support( 'custom-background' );
-                add_action( 'wp_head', $args[0]['wp-head-callback'] );
+                if ( $args[0]['wp-head-callback'] )
+                        add_action( 'wp_head', $args[0]['wp-head-callback'] );
 
                 if ( is_admin() ) {
                         require_once( ABSPATH . 'wp-admin/custom-background.php' );