From ee48cca207fa28757e85a25a6e91c121a1701f35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Helen=20Hou-Sand=C3=AD?= <helen.y.hou@gmail.com>
Date: Mon, 16 Nov 2020 19:20:09 +0000
Subject: [PATCH] Media: Avoid fatal error in `wp_prepare_attachment_for_js().

In certain contexts, in particular on the front-end, `get_media_states()` is not availble.

Props rebasaurus.
Fixes #51791.

Built from https://develop.svn.wordpress.org/trunk@49613


git-svn-id: http://core.svn.wordpress.org/trunk@49351 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/media.php   | 8 +++++---
 wp-includes/version.php | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/wp-includes/media.php b/wp-includes/media.php
index 8b8b862e5d..3d8507ff90 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -4029,9 +4029,11 @@ function wp_prepare_attachment_for_js( $attachment ) {
 		$response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );
 	}
 
-	$media_states = get_media_states( $attachment );
-	if ( ! empty( $media_states ) ) {
-		$response['mediaStates'] = implode( ', ', $media_states );
+	if ( function_exists( 'get_media_states' ) ) {
+		$media_states = get_media_states( $attachment );
+		if ( ! empty( $media_states ) ) {
+			$response['mediaStates'] = implode( ', ', $media_states );
+		}
 	}
 
 	/**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b87bbc1b28..344a968f57 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-beta4-49612';
+$wp_version = '5.6-beta4-49613';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.