diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f68759..fbb393e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,4 +6,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 - init module with Cookies & Browser redirection on Homepage only
+- handling of missing common JS library
 - remove dependency on JQuery
diff --git a/README.md b/README.md
index 0b80489..b19da99 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,13 @@ Drupal.homeRedirectLang.setPreferredLanguage('fr');
 ```
 
 ```javascript
+// Prevent attempting to attach cookie if the common library is not available.
+if (typeof Drupal.homeRedirectLang == "undefined") {
+  return;
+}
+
 let links = document.querySelectorAll('.language-link');
+
 links.forEach(link => {
   link.addEventListener('click', function (event) {
     var hreflang = event.target.getAttribute('hreflang');
diff --git a/js/home_redirect_lang.language_switcher.js b/js/home_redirect_lang.language_switcher.js
index 110e96d..a1a8f62 100644
--- a/js/home_redirect_lang.language_switcher.js
+++ b/js/home_redirect_lang.language_switcher.js
@@ -15,7 +15,14 @@
    */
   Drupal.behaviors.homeRedirectLangSwitcher = {
     attach: function (context) {
+
+      // Prevent attempting to attach cookie if the common library is not available.
+      if (typeof Drupal.homeRedirectLang == "undefined") {
+        return;
+      }
+
       let links = document.querySelectorAll('.language-switcher-language-url .language-link');
+
       links.forEach(link => {
         link.addEventListener('click', function (event) {
           var hreflang = event.target.getAttribute('hreflang');