From 51be161019871c14b0fd02e79b41ec872d576114 Mon Sep 17 00:00:00 2001
From: Weston Ruter <westonruter@git.wordpress.org>
Date: Sun, 25 Jun 2017 07:03:16 +0000
Subject: [PATCH] Customize: Ensure `header_image_data` setting exists before
 attempting to use it.

Amends [27497].
Props Collizo4sky.
Fixes #41007.


git-svn-id: https://develop.svn.wordpress.org/trunk@40935 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-admin/custom-header.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/wp-admin/custom-header.php b/src/wp-admin/custom-header.php
index b9aecf2485..85238bf21c 100644
--- a/src/wp-admin/custom-header.php
+++ b/src/wp-admin/custom-header.php
@@ -1321,7 +1321,12 @@ wp_nonce_field( 'custom-header-options', '_wpnonce-custom-header-options' ); ?>
 	 * @param WP_Customize_Manager $wp_customize Customize manager.
 	 */
 	public function customize_set_last_used( $wp_customize ) {
-		$data = $wp_customize->get_setting( 'header_image_data' )->post_value();
+
+		$header_image_data_setting = $wp_customize->get_setting( 'header_image_data' );
+		if ( ! $header_image_data_setting ) {
+			return;
+		}
+		$data = $header_image_data_setting->post_value();
 
 		if ( ! isset( $data['attachment_id'] ) ) {
 			return;