diff --git a/src/filters.php b/src/filters.php
index e65567d..6b73a36 100644
--- a/src/filters.php
+++ b/src/filters.php
@@ -46,7 +46,7 @@ add_filter('excerpt_more', function () {
  * Use theme wrapper
  */
 add_filter('template_include', function ($main) {
-    if (!is_string($main) || !(string) $main) {
+    if (!is_string($main) || !(is_object($main) && method_exists($main, '__toString'))) {
         return $main;
     }
     return template_wrap(new Wrapper($main));