From f2f4e21db472774eaa31c04f5cc7446aecde4552 Mon Sep 17 00:00:00 2001
From: Andrew Serong <14988353+andrewserong@users.noreply.github.com>
Date: Thu, 27 Oct 2022 16:27:14 +1100
Subject: [PATCH] Layout: ensure block content is always returned as a string
 (#45330)

---
 lib/block-supports/layout.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/block-supports/layout.php b/lib/block-supports/layout.php
index b61311362893a..0734936b2610b 100644
--- a/lib/block-supports/layout.php
+++ b/lib/block-supports/layout.php
@@ -305,7 +305,7 @@ function gutenberg_get_classnames_from_last_tag( $html ) {
 		$last_classnames = $tags->get_attribute( 'class' );
 	}
 
-	return $last_classnames;
+	return (string) $last_classnames;
 }
 
 /**
@@ -445,7 +445,7 @@ function gutenberg_render_layout_support_flag( $block_content, $block ) {
 		$content->add_class( implode( ' ', $class_names ) );
 	}
 
-	return $content;
+	return (string) $content;
 }
 
 // Register the block support. (overrides core one).