From dfc76de86afc620d9eebf4d2f328cd92eed72105 Mon Sep 17 00:00:00 2001
From: Victor Shih <victor.shih@gmail.com>
Date: Sun, 12 May 2024 02:13:45 -0700
Subject: [PATCH] Handle non-string lambda results.

---
 src/Mustache/Template.php | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/Mustache/Template.php b/src/Mustache/Template.php
index 4de82393..4ffddbff 100644
--- a/src/Mustache/Template.php
+++ b/src/Mustache/Template.php
@@ -170,9 +170,15 @@ protected function prepareContextStack($context = null)
     protected function resolveValue($value, Mustache_Context $context)
     {
         if (($this->strictCallables ? is_object($value) : !is_string($value)) && is_callable($value)) {
-            return $this->mustache
-                ->loadLambda((string) call_user_func($value))
-                ->renderInternal($context);
+            $result = call_user_func($value);
+
+            if (is_string($result)) {
+                return $this->mustache
+                    ->loadLambda($result)
+                    ->renderInternal($context);
+            } else {
+                return $result;
+            }
         }
 
         return $value;