diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2c35d1..0c796ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.14.2] - 23 August 2024
+### Fixed
+- Guarantee return type is string #170
+
 ## [0.14.1] - 23 August 2024
 ### Fixed
 - Add CSP nonces to inline scripts
diff --git a/Plugin/AddCspInlineScripts.php b/Plugin/AddCspInlineScripts.php
index 5137180..06ff649 100644
--- a/Plugin/AddCspInlineScripts.php
+++ b/Plugin/AddCspInlineScripts.php
@@ -18,7 +18,7 @@ public function __construct(
     public function afterToHtml(Template $block, $html): string
     {
         if (false === strstr((string)$block->getNameInLayout(), 'yireo_webp2.')) {
-            return $html;
+            return (string)$html;
         }
 
         return $this->replaceInlineScripts->replace((string)$html);
diff --git a/composer.json b/composer.json
index 0d6f82c..f5e4f7f 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
   "name": "yireo/magento2-webp2",
   "license": "OSL-3.0",
-  "version": "0.14.1",
+  "version": "0.14.2",
   "type": "magento2-module",
   "homepage": "https://www.yireo.com/software/magento-extensions/webp2",
   "description": "Magento 2 module to add WebP support to the Magento frontend",