diff --git a/src/index.js b/src/index.js
index 9addd7aa..55780082 100644
--- a/src/index.js
+++ b/src/index.js
@@ -16,33 +16,33 @@ const applyConfig = (config) => {
   // Changelogs
   config.settings.changelogUrlPrefix =
     config.settings.changelogPrefix || __SERVER__
-      ? process.env.RAZZLE_CHANGELOG_PREFIX
-      : window.env.RAZZLE_CHANGELOG_PREFIX || 'https://github.com/eea';
+      ? process.env?.RAZZLE_CHANGELOG_PREFIX
+      : window.env?.RAZZLE_CHANGELOG_PREFIX || 'https://github.com/eea';
 
   config.settings.changelogUrlSuffix =
     config.settings.changelogSuffix || __SERVER__
-      ? process.env.RAZZLE_CHANGELOG_SUFFIX
-      : window.env.RAZZLE_CHANGELOG_SUFFIX || 'releases';
+      ? process.env?.RAZZLE_CHANGELOG_SUFFIX
+      : window.env?.RAZZLE_CHANGELOG_SUFFIX || 'releases';
 
   config.settings.frontendVersion =
     config.settings.frontendVersion || __SERVER__
-      ? process.env.RAZZLE_FRONTEND_VERSION
-      : window.env.RAZZLE_FRONTEND_VERSION || frontendVersion;
+      ? process.env?.RAZZLE_FRONTEND_VERSION
+      : window.env?.RAZZLE_FRONTEND_VERSION || frontendVersion;
 
   config.settings.frontendName =
     config.settings.frontendName || __SERVER__
-      ? process.env.RAZZLE_FRONTEND_NAME
-      : window.env.RAZZLE_FRONTEND_NAME || frontendName;
+      ? process.env?.RAZZLE_FRONTEND_NAME
+      : window.env?.RAZZLE_FRONTEND_NAME || frontendName;
 
   config.settings.backendVersion =
     config.settings.backendVersion || __SERVER__
-      ? process.env.RAZZLE_BACKEND_VERSION
-      : window.env.RAZZLE_BACKEND_VERSION || '';
+      ? process.env?.RAZZLE_BACKEND_VERSION
+      : window.env?.RAZZLE_BACKEND_VERSION || '';
 
   config.settings.backendName =
     config.settings.backendName || __SERVER__
-      ? process.env.RAZZLE_BACKEND_NAME
-      : window.env.RAZZLE_BACKEND_NAME || 'plone-backend';
+      ? process.env?.RAZZLE_BACKEND_NAME
+      : window.env?.RAZZLE_BACKEND_NAME || 'plone-backend';
 
   // Persist FRONTEND_VERSION on backend registry
   if (__SERVER__) {