diff --git a/tracker/tracker/src/main/index.ts b/tracker/tracker/src/main/index.ts
index 2d090aebf..9349c05ca 100644
--- a/tracker/tracker/src/main/index.ts
+++ b/tracker/tracker/src/main/index.ts
@@ -97,7 +97,7 @@ function processOptions(obj: any): obj is Options {
 
 const canAccessTop = () => {
   try {
-    return Boolean(window.top)
+    return Boolean(window.top?.document)
   } catch {
     return false
   }
@@ -116,7 +116,7 @@ export default class API {
     }
     if (
       (window as any).__OPENREPLAY__ ||
-      (!this.crossdomainMode && inIframe() && canAccessTop() && (window.top as any)?.__OPENREPLAY__)
+      (!this.crossdomainMode && inIframe() && canAccessTop() && (window.top as any).__OPENREPLAY__)
     ) {
       console.error('OpenReplay: one tracker instance has been initialised already')
       return