diff --git a/wp-includes/class-wp-theme-json-resolver.php b/wp-includes/class-wp-theme-json-resolver.php
index 1924d1a471..e696eef894 100644
--- a/wp-includes/class-wp-theme-json-resolver.php
+++ b/wp-includes/class-wp-theme-json-resolver.php
@@ -515,7 +515,7 @@ class WP_Theme_JSON_Resolver {
 
 		$global_style_query = new WP_Query();
 		$recent_posts       = $global_style_query->query( $args );
-		if ( count( $recent_posts ) === 1 ) {
+		if ( count( $recent_posts ) === 1 && $recent_posts[0] instanceof WP_Post ) {
 			$user_cpt = get_object_vars( $recent_posts[0] );
 		} elseif ( $create_post ) {
 			$cpt_post_id = wp_insert_post(
@@ -532,7 +532,10 @@ class WP_Theme_JSON_Resolver {
 				true
 			);
 			if ( ! is_wp_error( $cpt_post_id ) ) {
-				$user_cpt = get_object_vars( get_post( $cpt_post_id ) );
+				$post = get_post( $cpt_post_id );
+				if ( $post instanceof WP_Post ) {
+					$user_cpt = get_object_vars( $post );
+				}
 			}
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 20dbf719e3..333dadc3ae 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-alpha-61399';
+$wp_version = '7.0-alpha-61400';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.