Ticket #56746: 56746.patch

customize/class-wp-customize-background-image-setting.php

@@ -26 +26 @@
 
         /**
          * @since 3.4.0
-         *
-         * @param mixed $value The value to update. Not used.
          */
-        public function update( $value ) {
+        public function update() {
                 remove_theme_mod( 'background_image_thumb' );
         }
 }