diff --git a/src/wp-includes/revision.php b/src/wp-includes/revision.php
index 941002ffc6..06701eb89c 100644
--- a/src/wp-includes/revision.php
+++ b/src/wp-includes/revision.php
@@ -638,16 +638,15 @@ function _set_preview( $post ) {
 	}
 
 	$preview = wp_get_post_autosave( $post->ID );
-	if ( ! is_object( $preview ) ) {
-		return $post;
+
+	if ( is_object( $preview ) ) {
+		$preview = sanitize_post( $preview );
+
+		$post->post_content = $preview->post_content;
+		$post->post_title   = $preview->post_title;
+		$post->post_excerpt = $preview->post_excerpt;
 	}
 
-	$preview = sanitize_post( $preview );
-
-	$post->post_content = $preview->post_content;
-	$post->post_title   = $preview->post_title;
-	$post->post_excerpt = $preview->post_excerpt;
-
 	add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
 	add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 );