diff --git a/src/utils/matomo.ts b/src/utils/matomo.ts
index 0d557c006..0cac683c7 100644
--- a/src/utils/matomo.ts
+++ b/src/utils/matomo.ts
@@ -1,7 +1,7 @@
 export const track = (category: string, action: string, name: string, ignoreReferrer?: boolean) => {
   if (window && window.please) {
     const url =
-      document.location.ancestorOrigins.length > 0
+      document.location.ancestorOrigins && document.location.ancestorOrigins.length > 0
         ? document.location.ancestorOrigins[0]
         : document.location?.origin || document.referrer
     if (!ignoreReferrer && url && !url.startsWith('https://impactco2.fr')) {