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Server : Apache
System : Linux methusalix2 3.16.0-11-amd64 #1 SMP Debian 3.16.84-1 (2020-06-09) x86_64
User : hios ( 1437)
PHP Version : 5.6.40-0+deb8u12
Disable Function : proc_close,proc_open,dl,shell_exec,passthru
Directory :  /home/hios/public_html/wp-includes/customize/

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Current File : /home/hios/public_html/wp-includes/customize/class-wp-customize-background-image-setting.php
<?php
/**
 * Customize API: WP_Customize_Background_Image_Setting class
 *
 * @package WordPress
 * @subpackage Customize
 * @since 4.4.0
 */

/**
 * Customizer Background Image Setting class.
 *
 * @since 3.4.0
 *
 * @see WP_Customize_Setting
 */
final class WP_Customize_Background_Image_Setting extends WP_Customize_Setting {
	public $id = 'background_image_thumb';

	/**
	 * @since 3.4.0
	 *
	 * @param $value
	 */
	public function update( $value ) {
		remove_theme_mod( 'background_image_thumb' );
	}
}

Samx