diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 62d587bf6a..9330d2789b 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -2263,6 +2263,9 @@ final class WP_Customize_Manager {
 			}
 
 			$existing_changeset_data = $this->get_changeset_post_data( $changeset_post_id );
+			if ( is_wp_error( $existing_changeset_data ) ) {
+				return $existing_changeset_data;
+			}
 		}
 
 		// Fail if attempting to publish but publish hook is missing.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d2cecbf22f..5253bf6eac 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41011';
+$wp_version = '4.9-alpha-41012';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.