diff --git a/src/wp-includes/ms-site.php b/src/wp-includes/ms-site.php
index 60d1f29035..ddc71380b3 100644
--- a/src/wp-includes/ms-site.php
+++ b/src/wp-includes/ms-site.php
@@ -69,6 +69,10 @@ function wp_insert_site( array $data ) {
 
 	$new_site = get_site( $wpdb->insert_id );
 
+	if ( ! $new_site ) {
+		return new WP_Error( 'get_site_error', __( 'Could not retrieve site data.' ) );
+	}
+
 	clean_blog_cache( $new_site );
 
 	/**